BMW Engine Parts for BMW 3 Series E46 (1999-2005)

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Turner Motorsport has everything you need to upgrade your BMW through our stages of performance or to keep your car in peak condition with our range of the latest in proven OEM cooling parts. Upgrade your cooling system and engine performance with the selections below to give your BMW a performance and reliability advantage.

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Eldor - Corporate Logo
T#:641259
Part#: 12138657273
In Stock
$ 34.99 USD
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Used in a wide variety of BMW engines to ensure proper spark plug operation.
Eldor - Corporate Logo
T#:29234309
Part#: 12138616153
In Stock
$ 43.99 USD
Free Shipping on orders $49 and up

Ignition coils are key to the efficiency and performance of your BMW. With a faulty coil the spark plug is not burning the air/fuel mixture properly and that can lead to problems anywhere in the engine and exhaust (including catalytic converters and O2 sensors). Problems with one or more coils will cause a fault code but not always a check engine light. A misfire code may be related to an ignition coil but could be from other things as well. Sometimes a visual inspection of a coil and coil boot will give an indication of a failure. You can also move coils around to different cylinder banks to see if the misfire code follows a suspect coil. We suggest always having one or two coils on hand to keep as spares.

This is the current replacement for some BMW 6 and 8-cylinder engines built in the late 2000s and after. BMW has made numerous changes to ignition coil part numbers in recent years but has approved this part number to work in the vehicles listed below. It's listed as a replacement coil for N20, N55, and S55 engines. In March 2015 BMW approved it for N51/N52 engines. This part number replaces the previous BMW part number 12137594937 for the cars listed below.

Sold per coil. Includes boot and connector.

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Hella - Corporate Logo
T#:40004874
Part#: 16142229684
In Stock
$ 253.79

This product was last offered at the strikethrough price on
07-23-2026

$ 208.99 USD
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$ 208.99 USD
Free Shipping on orders $49 and up

Mahle - Corporate Logo
T#:598529
Part#: 11251437077
In Stock
$ 38.99

This product was last offered at the strikethrough price on
10-27-2026

$ 34.99 USD
Free Shipping on orders $49 and up
$ 34.99 USD
Free Shipping on orders $49 and up

Ensure optimal engine performance in your BMW M50 M52 Engines with Turner Motorsport's Mahle Piston Ring Set. Over time, worn piston rings can lead to power loss, increased oil consumption, and white smoke from the tailpipe. When rebuilding your BMW's engine, replacing the piston rings is essential for restoring power and efficiency. Each set is priced individually, with six sets required for complete engine overhaul.

Key Benefits:

  • Restores engine power and efficiency
  • Reduces oil consumption
  • Prevents white smoke from the tailpipe
  • Compatible with M50 M52 Engines
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OEM Hengst Fuel Filter - E46 M3, Z3 S54
5X Entries Into Our F80 M3 Sweepstakes 2X Entries For Our Spin To Win Sweepstakes!
5X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat! Hengst is our preferred OEM filtration supplier!
Hengst - Corporate Logo
T#:582298
Part#: 13327831089
In Stock
$ 29.99 USD
Free Shipping on orders $49 and up
A clogged fuel filter makes it difficult for your engine to get all the fueling it needs. Filters commonly clog from a deteriorating gas tank, bad fuel, or other debris in the fuel system. A fresh fuel filter addresses many fuel related problems including surging, stalling, cold start issues, and poor performance under a variety of conditions.
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Hella - Corporate Logo
T#:388896
Part#: 12141709616
Back Ordered
$ 40.99 USD
Free Shipping on orders $49 and up

Faulty crankshaft position sensors can cause issues with proper ignition timing and adjustment leading to rough idle, stalling, and potential engine damage. A high quality OEM Hella replacement will have your BMW running smoothly for much less than the cost of a Genuine BMW sensor.

Hella is a premium manufacturer that supplies automotive parts to numerous car brands across the world. Everything from electrical to mechanical genuine parts have been made and supplied directly to BMW before the vehicles ever leave the production floor. Their high quality, long lasting parts have made them a trusted brand chosen to help keep your BMW on the road for many years to come.

As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!

Fits BMW models with the following engines: M52 S52 M54 M56

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Hengst Fuel Filter with Pressure Regulator - E46 Z3
5X Entries Into Our F80 M3 Sweepstakes 2X Entries For Our Spin To Win Sweepstakes!
5X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Hengst - Corporate Logo
T#:596584
Part#: 13327512019
In Stock
$ 75.99 USD
Free Shipping on orders $49 and up
OEM Starter Motor - E46 M3 2001-2006
We Price Match - Give Us A Call or Chat!
Valeo - Corporate Logo
T#:2988
Part#: 12417835735
Ships in 1 Business Day
$ 389.99 USD
Free Shipping
$ 389.99 USD
Free Shipping
This is the starter motor for BMW E46 M3 2001-2006 is an OEM Valeo unit.

This item fits the following BMWs:
2001-2006 E46 BMW M3. M3 Convertible
2001-2002 Z3 BMW Z3 M Roadster Z3 M Coupe
2005-2008 E85 BMW Z4 M Roadster Z4 M Coupe
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Ajusa - Corporate Logo
T#:363428
Part#: 11321748884
Ships in 4 Business Days
$ 34.99 USD
Free Shipping on orders $49 and up
Also commonly called cam follower

Hella - Corporate Logo
T#:11919
Part#: 13621739510
Back Ordered
$ 38.99 USD
Free Shipping on orders $49 and up

The temperature sensor is mounted in either the intake manifold or the intake air box assembly depending on the model of car. This OEM Hella replacement will insure proper readings and fuel/air mixtures for the given temperature.

Hella is a premium manufacturer that supplies automotive parts to numerous car brands across the world. Everything from electrical to mechanical genuine parts have been made and supplied directly to BMW before the vehicles ever leave the production floor. Their high quality, long lasting parts have made them a trusted brand chosen to help keep your BMW on the road for many years to come.

As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!

This item fits the following BMWs:
1996-1998 E36 BMW 318i 318is 318ti 318ic 323is 323ic 328i 328is 328ic M3
1999-2000 E46 BMW 323i 323ci 328i 328ci
2001-2005 E46 BMW 325i 325ci 325xi 330i 330ci 330xi - M54 engine only
1997-2003 E39 BMW 525i 528i 530i 540i
1997-2001 E38 BMW 740i 740il 750il
2004-2006 E83 BMW X3 2.5i X3 3.0i
2000-2006 E53 BMW X5 3.0i
1997-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i
1998-2000 Z3 BMW M Roadster M Coupe

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Mahle - Corporate Logo
T#:403354
Part#: 13327831089
Ships in 1 Business Day
$ 84.05

This product was last offered at the strikethrough price on
10-27-2026

$ 76.26 USD
Free Shipping on orders $49 and up
$ 76.26 USD
Free Shipping on orders $49 and up

Ensure optimal fuel delivery for your BMW's engine with the Turner Motorsport Fuel Filter for E46 M3 & Z3 S54 3.2L Engine. Over time, fuel filters can become clogged, hindering the engine's ability to receive sufficient fuel. This can lead to various fuel-related issues such as surging, stalling, cold start problems, and decreased performance. Replacing the fuel filter with a fresh one helps address these issues and ensures smooth engine operation under various conditions.

Benefits:

  • Improves fuel delivery to the engine
  • Addresses fuel-related problems such as surging and stalling
  • Enhances cold start performance
  • Maintains engine performance under various driving conditions
  • Recommended replacement every 60,000 miles, or more frequently in regions with poor fuel quality
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Mahle - Corporate Logo
T#:367343
Part#: 13321740985
Ships in 1 Business Day
$ 46.05

This product was last offered at the strikethrough price on
07-02-2026

$ 35.28 USD
Free Shipping on orders $49 and up
$ 35.28 USD
Free Shipping on orders $49 and up

This is an OEM MAHLE fuel filter that removes dirt and other particle contaminants from your fuel.

A clogged fuel filter makes it difficult for your engine to get all the fueling it needs. Filters commonly clog from a deteriorating gas tank, bad fuel, or other debris in the fuel system. A fresh fuel filter addresses many fuel related problems including surging, stalling, cold start issues, and poor performance under a variety of conditions.

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OEM Hengst Engine Oil Filter Kit - Pack of 5 - M52 M54
5X Entries Into Our F80 M3 Sweepstakes 2X Entries For Our Spin To Win Sweepstakes!
5X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat! Hengst is our preferred OEM filtration supplier!
Hengst - Corporate Logo
T#:586192
Part#: 11427512300HKT
In Stock
$ 54.99

This product was last offered at the strikethrough price on
10-13-2026

$ 38.99 USD
Free Shipping on orders $49 and up
$ 38.99 USD
Free Shipping on orders $49 and up
Stock up on oil filters and save some cash! You are going to need them, why not get a discount? This is an OEM Hengst oil filter kit made with the same materials and design as the original oil filter used in BMW dealers (but at a better price!). The kit includes the oil filter, housing cap o-ring, and washer.
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Hella - Corporate Logo
T#:2123
Part#: 12617508003
Back Ordered
$ 85.83 USD
Free Shipping on orders $49 and up
$ 85.83 USD
Free Shipping on orders $49 and up
This is the oil level sensor / sender for BMW E46 E39 E60 E38 X3 X5 Z3 Z4 Z8.When this part fails it will illuminate a check light on the dash which indicates it needs to be replaced. Includes o-ring.Manufactured by Hella.

Hella is a premium manufacturer that supplies automotive lighting products for numerous car brands around the world. Their high quality, long lasting parts have made them a trusted brand chosen to help keep your BMW bright and visible for many years to come.

This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330xi M3
2008+ E90 BMW 335d
1999-2003 E39 BMW 528i 525i 530i M5
1998-2003 E39 BMW 540i
2004-2005 E60 BMW 525i 530i
1998-2001 E38 BMW 740i 740il 750il
2004-2006 E85 BMW X3 2.5i X3 3.0i
2000-2006 E53 BMW X5 3.0i
2000-2003 E53 BMW X5 4.4i X5 4.6is
1999-2002 Z3 BMW Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i
2001-2002 Z3 BMW Z3 M Roadster Z3 M Coupe
2003-2006 Z4 BMW Z4 2.5i Z4 3.0i
2000-2003 E52 BMW Z8
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Hella - Corporate Logo
T#:592707
Part#: 2768551
In Stock
$ 30.99 USD
Free Shipping on orders $49 and up
Disc Type High-Tone, 12 V, 400 Hz with Bracket

Hella - Corporate Logo
T#:590880
Part#: 2768082
In Stock
$ 36.99 USD
Free Shipping on orders $49 and up
Disc Type Low-Tone, 12 V, 335 Hz with Bracket

E46 M3, MZ3 S54 OEM Valeo Alternator (New)
We Price Match - Give Us A Call or Chat!
Valeo - Corporate Logo
T#:377735
Part#: 12317831436
In Stock at Vendor
$ 522.00

This product was last offered at the strikethrough price on
07-16-2026

$ 473.99 USD
Free Shipping
$ 473.99 USD
Free Shipping

The alternator in your vehicle keeps the battery at full charge when your engine is running. Because all of your electronic systems run off of this small piece, it's important that it is operational. If your lights are dim while driving or your battery dies within minutes of starting your car, it's time for a new alternator.

This is a NEW alternator from the OEM manufacturer, Valeo. No core charge applies.

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Engine Crankcase Breather Element
Superior performance for both warm and cold climates
5X Entries Into Our F80 M3 Sweepstakes 2X Entries For Our Spin To Win Sweepstakes!
5X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Hengst - Corporate Logo
T#:35795496
Part#: 11617533400
In Stock
$ 41.99 USD
Free Shipping on orders $49 and up
$ 41.99 USD
Free Shipping on orders $49 and up
Commonly referred to as the "oil separator" or PCV URO Parts is one of the leading manufacturers of high quality direct replacement aftermarket components, covering a wide range of makes and models. All of their replacement parts are manufactured to ISO 9000 certification standards, so you can expect long lasting performance from URO Parts.
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Hella - Corporate Logo
T#:302290
Part#: 12147518628H
In Stock
$ 72.99 USD
Free Shipping on orders $49 and up

Used to detect the position of the camshaft, this sensor allows the computer to adjust the ignition timing for optimal performanceand to prevent damage from early or late detonation. Hella replacement sensors will ensure long lasting reliability and will keep your engine running like new.

Hella is a premium manufacturer that supplies automotive parts to numerous car brands across the world. Everything from electrical to mechanical genuine parts have been made and supplied directly to BMW before the vehicles ever leave the production floor. Their high quality, long lasting parts have made them a trusted brand chosen to help keep your BMW on the road for many years to come.

As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!

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Hella - Corporate Logo
T#:592708
Part#: 3001651
In Stock
$ 139.99

This product was last offered at the strikethrough price on
08-03-2026

$ 121.99 USD
Free Shipping on orders $49 and up
$ 121.99 USD
Free Shipping on orders $49 and up
Get noticed with this air horn kit from Hella!


Valeo - Corporate Logo
T#:371896
Part#: 12317501599
Ships on Dec 7, 2026
$ 323.99 USD
Free Shipping
$ 323.99 USD
Free Shipping

The alternator in your vehicle keeps the battery at full charge when your engine is running. Because all of your electronic systems run off of this small piece, it's important that it is operational. If your lights are dim while driving or your battery dies within minutes of starting your car, it's time for a new alternator.

This is a NEW alternator from the OEM manufacturer, Valeo. No core charge applies. Valeo is an OEM manufacturer for many BMW alternators - save money by buying the same alternator in a different box!

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Hella - Corporate Logo
T#:21900127
Part#: 12617508003HKT
Back Ordered
$ 91.99 USD
Free Shipping on orders $49 and up

Ensure your BMW's oil level is accurately monitored with the Bremmen Parts oil level sensor. If your car displays a yellow oil light upon startup, it's a sign of a failing sensor affecting oil level readings. Simple to replace, this sensor is located at the oil pan's bottom. Follow straightforward steps: drain the oil, replace the sensor, clean the area, and install the new sensor. The kit includes a new sealing O-ring for a leak-free installation, ensuring your engine's proper oil level monitoring.

Key Benefits:

  • Addresses yellow oil light indicating sensor failure
  • Easy replacement process located at the oil pan's bottom
  • Includes sealing O-ring for leak-free installation
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Ajusa - Corporate Logo
T#:379575
Part#: 11611436631
Ships in 3 Business Days
$ 29.99 USD
Free Shipping on orders $49 and up
This intake manifold gasket set fits BMW E46 323i 323ci 325i 325ci 325xi 330i 330ci 330xi - E39 528i 525i 530i -1999-2003 - E60 525i 525xi 530i 530xi 2004-2005 - X3 2.5i 3.0i - X5 3.0i - Z3 2.5i 2.8i 3.0i 1999-2002 - Z4 2.5i 3.0i 2003-2006. This item fits the following BMWs: 1999-2006 E46 BMW 323i 323ci 328i 328ci 330i 330ci 330xi 2001-2006 E46 BMW 325i 325ci 325xi only with M54 engine 1999-2003 E39 BMW 525i 528i 530i 2004-2005 E60 BMW 525i 525xi 530i 530xi 2004-2006 E83 BMW X3 2.5i X3 3.0i 2000-2006 E53 BMW X5 3.0i 1999-2002 Z3 BMW Z3 2.5i Z3 2.8 Z3 3.0i 2003-2006 Z4 BMW Z3 2.5i Z3 3.0i
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OEM Hengst Engine Oil Filter Kit - S50 3.0L, S52 S54 3.2L
5X Entries Into Our F80 M3 Sweepstakes 2X Entries For Our Spin To Win Sweepstakes!
5X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat! Hengst is our preferred OEM filtration supplier!
Hengst - Corporate Logo
T#:568562
Part#: 11427833769
In Stock
$ 17.99

This product was last offered at the strikethrough price on
10-12-2026

$ 14.99 USD
Free Shipping on orders $49 and up
$ 14.99 USD
Free Shipping on orders $49 and up
This is an OEM Hengst oil filter kit made with the same materials and design as the original oil filter used in BMW dealers (but at a better price!). The kit includes the oil filter, housing cap o-ring, and washer.
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OEM Hengst Fuel Filter - E34 530i/540i, E36 325i/328i/M3, Z3, E38 740...
5X Entries Into Our F80 M3 Sweepstakes 2X Entries For Our Spin To Win Sweepstakes!
5X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat! Hengst is our preferred OEM filtration supplier!
Hengst - Corporate Logo
T#:388256
Part#: 13321740985
In Stock
$ 16.99

This product was last offered at the strikethrough price on
06-19-2026

$ 16.49 USD
Free Shipping on orders $49 and up
$ 16.49 USD
Free Shipping on orders $49 and up
A must for any tune-up and the source for a lot of engine issues, including: hard starting, hesitations, lean mixture faults, misfire faults, and stallings. The fuel filter is easy to change and it's recommended to replace it every 30-40,000 miles. This is an OEM Hengst filter.
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Ajusa - Corporate Logo
T#:379599
Part#: 11129070990
In Stock
$ 48.99

This product was last offered at the strikethrough price on
11-07-2026

$ 44.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
$ 48.99

This product was last offered at the strikethrough price on
11-07-2026

$ 44.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up

Mahle - Corporate Logo
T#:341049
Part#: 11427512300
Ships in 1 Business Day
$ 22.38

This product was last offered at the strikethrough price on
05-20-2026

$ 16.98 USD
Free Shipping on orders $49 and up
$ 16.98 USD
Free Shipping on orders $49 and up
OE quailty for your BMW

OEM Hengst Engine Oil Filter Kit - M52 M54
5X Entries Into Our F80 M3 Sweepstakes 2X Entries For Our Spin To Win Sweepstakes!
5X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat! Hengst is our preferred OEM filtration supplier!
Hengst - Corporate Logo
T#:568200
Part#: 11427512300
In Stock
$ 10.99

This product was last offered at the strikethrough price on
10-12-2026

$ 7.67 USD
Free Shipping on orders $49 and up
$ 7.67 USD
Free Shipping on orders $49 and up
This is an OEM Hengst oil filter kit made with the same materials and design as the original oil filter used in BMW dealers (but at a better price!). The kit includes the oil filter, housing cap o-ring, and washer.
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Hella - Corporate Logo
T#:592718
Part#: 965400001
In Stock
$ 14.99 USD
Free Shipping on orders $49 and up
12V 30A SPST relay with bracket

Hella - Corporate Logo
T#:592716
Part#: 7424011
In Stock
$ 17.99 USD
Free Shipping on orders $49 and up

Upgrade the sound of your BMW or MINI with the Hella Horn - High-Tone. This high-quality horn delivers a powerful and attention-grabbing sound, enhancing safety on the road. Designed for easy installation, it provides a quick and effective way to improve the audible presence of your vehicle.

  • Powerful and attention-grabbing sound
  • Enhances safety on the road
  • Easy installation for convenience
  • Compatible with BMW and MINI models
  • High-quality construction for durability

Enhance the audible presence of your BMW or MINI with the Hella Horn - High-Tone, ensuring you're heard when it matters most.

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Hella - Corporate Logo
T#:28869559
Part#: 7424001
Back Ordered
$ 17.99 USD
Free Shipping on orders $49 and up
Universal fit. Not direct fit.

Ajusa - Corporate Logo
T#:639918
Part#: 12611744292
Ships in 3 Business Days
$ 8.99 USD
Free Shipping on orders $49 and up
If you are replacing your oil level sensor for any reason, it is highly recommended that you replace this seal as well to prevent any future leaks. This item fits the following BMW Chassis: E39 M5,E60 M5,E63 M6,E46 M3,E70 X5M,E71 X6M,E82 1M Coupe,E85 Z4M,E53 48IS,E38,E39,E46,E53 X5 X5,E63,E65,E70 X5,E71 X6,E82,E83 X3,E85 Z4,E86 Z4,E89 Z4,E90,E92,E93,F01,F02,F06,F10,F12,F13,F15,F16,F22,F25 X3,F26 X4 X4,F30,F32,F33,F34,F36
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Vaico - Corporate Logo
T#:57231520
Part#: 07119901299
In Stock
New Item
$ 2.99 USD
Free Shipping on orders $49 and up
M8x16
Mahle - Corporate Logo
T#:4405
Part#: 11427833769ML
Ships in 1 Business Day
$ 16.99

This product was last offered at the strikethrough price on
07-23-2026

$ 15.47 USD
Free Shipping on orders $49 and up
$ 15.47 USD
Free Shipping on orders $49 and up
This is the replacement OEM oil filter kit for the S54 engine, as used in the E46 M3, Z4 M Roadster and M Coupe, as well as the 2001-2002 MZ3 M Roadster/Coupe (with S54 engine). This is the complete oil filter kit - filter, large o-ring for filter housing cover, small o-ring for bolt seal, flat washer for bolt, and copper seal ring for the drain bolt. It's everything you would need to complete an oil change - minus the Castrol 10W60 oil of course, which we sell at a great price. This kit is manufactured by Mahle - the original supplier to BMW for the 11427833769 BMW filter (factory filters come with the Mahle part number OX 187 printed on the cap).

Why Mahle over Mann? In the past we have sold a few different oil filters for the E46 M3 and S54 engines. But Mahle is the true OEM supplier for this part number. It fits perfectly and is the exact replacement part at nearly the same price as the slightly different Mann filter (and less than the factory BMW filter). For more detail, click here.

This filter fits the following BMWs:
2001-2006 E46 M3
2001-2002 MZ3 - M Roadster & M Coupe (S54)
2006-2008 MZ4 - M Roadster & M Coupe
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Hella - Corporate Logo
T#:591881
Part#: 12611710509
Special Order: No Guaranteed ETA
$ 7.99 USD
Free Shipping on orders $49 and up
Leaking or malfunctioning oil pressure switches can be disastrous


Mahle - Corporate Logo
T#:367338
Part#: 13327512019
Special Order: No Guaranteed ETA
$ 70.37 USD
Free Shipping
$ 70.37 USD
Free Shipping

This is an OEM MAHLE fuel filter that removes dirt and other particle contaminants from your fuel.

A clogged fuel filter makes it difficult for your engine to get all the fueling it needs. Filters commonly clog from a deteriorating gas tank, bad fuel, or other debris in the fuel system. A fresh fuel filter addresses many fuel related problems including surging, stalling, cold start issues, and poor performance under a variety of conditions.

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Ajusa - Corporate Logo
T#:384836
Part#: 11421719855
Back Ordered
$ 8.99 USD
Free Shipping on orders $49 and up
This is the replacement for the troublesome oil filter profile gasket on the M50, S50US, M52, S52, M52TU, M54, and S54 engines. The housing is separate from the engine block and in between there is this small profile gasket. The gasket shrinks over time which allows oil to seep out. In our own service shop, it's one of the most common service jobs we perform. One of the other common leak points is the VAN0S oil line and its seals. Since the line comes out with the oil filter housing anyway you might as well replace the line itself or at least the seals. On S54 engines (E46 M3, MZ3, Z4 M) there is a flanged head bolt going into the cylinder head, behind the thermostat cover. This holds the left side timing chain guide rail in place and if it's loose or falls out you could have a very serious engine failure to deal with. Make sure to check this bolt while you're replacing the oil filter housing seal. You only need to make sure it's tight. But if it's come loose you may want to replace the seal ring and use a small touch of oil-resistant thread sealer.
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