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BMW Cooling System Parts & Accessories for BMW E90 M3 S65 4.0L

The cooling system is arguably the weakest point in numerous BMWs. If you drive an aging BMW or plan on taking your car to the track like we do, we recommend beefing up your cooling system before going to the track. Generally, the main components in your cooling system that are prone to failure include the following: expansion tank, factory hoses, water pump, thermostat, fan (especially if your vehicle comes factory with a clutch fan), and radiator. Factory BMW expansion tanks are plastic and prone to either breaking off at connection points or combusting. As factory rubber hoses age they either crack or break over time - we offer silicone cooling hose upgrades for most applications to avoid future failures. If you have an older vehicle, your water pump likely comes from the factory with a plastic impeller - we offer upgraded water pumps with metal impellers that are far more reliable. Newer model BMWs utilize electric water pumps - BMW spent millions of dollars engineering these water pumps, but they fail so often that we recommend replacing at 60,000 mile service intervals to avoid being stranded on the side of the road. In terms of thermostats, we offer various upgraded thermostats for racing applications. If your BMW utilizes a clutch fan from the factory, we have several options available in terms of universal electric fans - we recommend replacing these to avoid sending brittle plastic fan blades through your hood. For radiators, we recommend swapping out your radiator for one that does not use plastic connection points like your factory radiator.

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Basic Cooling System Service Kit - E9X M3 S65 - Dry

10X Entries Into Our F80 M3 Sweepstakes

T#:53891614

Part#: 17112283500KT

Ships in 1 Business Day

$ 540.99

This product was last offered at the strikethrough price on
07-08-2026

$ 524.99 USD

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$ 524.99 USD

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Water Pump And Thermostat Kit

10X Entries Into Our F80 M3 Sweepstakes

T#:15744014

Part#: 82142209769-KT

Ships in 1 Business Day

Sale - Save 9% $ 222.99

This product was last offered at the strikethrough price on
05-03-2026

$ 202.73 USD

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Sale - Save 9%

$ 222.99

This product was last offered at the strikethrough price on
05-03-2026

$ 202.73 USD

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The water pumps in these BMW models should be serviced near 80,000 miles and may become an issue often times leaving the owner stranded. The aftermarket kit offered provides a single stop for water pump and thermostat replacement needs to save the search and get you back on the road. Kit includes: Mahle-Behr thermostat Geba water pump Vaico coolant Mounting hardware required for the water pump O-rings for the thermostat housing

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BMW Racing Oil Cooler - E90/E92 M3 - DKG / DCT

For DCT/DKG Transmission Only

T#:23913952

Part#: OC-110

In Stock at Vendor

$ 1,299.99 USD

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$ 1,299.99 USD

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The do88 oil cooler boasts substantial advantages over the original: 217% larger core volume: 2208 cm3 vs. 696 cm3 178% greater active cooling area: 3456 cm2 vs. 1242 cm2 18% lower oil temperature past the oil cooler: 74°C vs. 90°C 110% larger oil volume: 6.5dl vs. 3.1dl Convenient drop-in fitment for the specified cars.

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BigPack BMW M3 E90/E92 - Manual

For manual transmissions only!

T#:35761627

Part#: BIG-M3-MAN

In Stock

$ 1,972.99

This product was last offered at the strikethrough price on
10-01-2026

$ 1,799.99 USD

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$ 1,799.99 USD

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The BigPack Kit for the E90/E92 M3 Includes - M3 engine oil cooler - M3 power steering cooler - M3 radiator

DO88 Coolant Hoses - Black - E90/E92 M3

T#:13924825

Part#: DO88KIT94S

In Stock

$ 291.99 USD

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$ 291.99 USD

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Made out of high-quality silicone, these hoses display the highest levels of durability and quality. With three to five layers of armory the hoses are designed to withstand high pressure and heat for an extended period of time. The OE hoses are known to crack and leak but this hose kit eliminates any chance of that.

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DO88 Coolant Hoses - Blue - E90/E92 M3

T#:13924827

Part#: DO88KIT94B

In Stock

$ 291.99

This product was last offered at the strikethrough price on
08-07-2026

$ 250.99 USD

Limited Qty Sale

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Qty

$ 291.99

This product was last offered at the strikethrough price on
08-07-2026

$ 250.99 USD

Limited Qty Sale

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DO88 Coolant Hoses - Red - E90/E92 M3

T#:13924826

Part#: DO88KIT94R

Ships on Oct 27, 2026

$ 291.99 USD

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$ 291.99 USD

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BMW Cooling System Parts & Accessories for BMW E90 M3 S65 4.0L

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Basic Cooling System Service Kit - E9X M3 S65 - Dry

Water Pump And Thermostat Kit

BMW Racing Oil Cooler - E90/E92 M3 - DKG / DCT

BigPack BMW M3 E90/E92 - Manual

DO88 Coolant Hoses - Black - E90/E92 M3

DO88 Coolant Hoses - Blue - E90/E92 M3

DO88 Coolant Hoses - Red - E90/E92 M3

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