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BMW Radiators

We sell only OE supplier or approved aftermarket upgrade radiators for your BMW. It seems BMW took some shortcuts when it came to radiator design and used weak materials like plastic for critical connection points. If you are tracking older models like E30, E36, or E46, you probably are well aware of these issues. As these cars age, the plastic pieces become more brittle and failure prone. The solution is to replace with upgraded radiators that perform as upgrades for the original, failure prone radiator to avoid being left on the side of the road or, worse yet, the track.

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Dinan High-Performance Heat Exchanger - F22/23 F3X B46/48 B58 ...

Call In Or Chat For Best Price! 10X Entries Into Our F80 M3 Sweepstakes

T#:21045539

Part#: D780-0002

Ships in 6 Business Days

11% off MSRP $ 658.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 584.99 USD

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11% off MSRP

$ 658.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 584.99 USD

Add to Wish List

The factory B4x/B58 heat exchanger is not built to cater to the rigorous demands often associated with a modified build. The thin core is easily overwhelmed with IAT's rising dramatically once pushed beyond a few successive WOT pulls or even a few minutes at the track. This elevation in temperature gives way to the factory ECU fail safes pulling timing and reducing overall power in order to keep the system from overheating to the point of permanent damage. On an application where enjoyment is directly attributed to pushing the platform to its limits this constraint to cooling presents a challenge for the automotive enthusiast. The Dinan B4x/B58 heat exchanger for the F2x/F3x chassis assists in mitigating these issues with a more robust core (48mm thick Dinan core vs. 27mm thick OEM core) that wields 78% more heat transfer surface area for improved cooling capacity. The significant increase in core thickness requires unique "L" shaped end tanks to be incorporated as well, which also contributes to the overall thermal mass (ability to absorb, store, and release heat) improvement beyond the OEM setup. With up to a 15° IAT delta recorded over stock the Dinan heat exchanger is ready, and able, to assist in extending your vehicles ability to deliver maximum performance time and time again for your driving enjoyment! Features: Average of 8° reduction in IAT's with a maximum reduction of 15° over 15 successive WOT pulls Reduces the tendency to heat soak / go in to limp mode 48mm thick Dinan cooler vs. 27mm thick stock cooler 78% more cooling surface area and volume than stock 100% TIG welded and pressure tested Installation hardware included (inclusive of xDrive specific transmission oil cooler brackets) NOTE: Due to the enlarged core and unique "L" shaped endtanks minor modification to the plastic core stack shroud may be required with some factory configurations ( particularly those with the optional OEM hot climate heat exchanger). Consult the installation PDF for full documentation on what exactly that entails. (https://documents.dinancars.com/d780-0002.pdf)

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Automatic Transmission Cooler - E36 Z3 E34

T#:2069

Part#: 17201728770

Ships in 2 Business Days

$ 207.15

This product was last offered at the strikethrough price on
05-11-2026

$ 201.87 USD

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$ 201.87 USD

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This transmission fluid/oil cooler fits E36 318i 318is 318ti 323i 323is 325i 325is 328i 328is M3, E34 525i 530i 1993-1995 and Z3 1.9 2.3 2.5i 2.8 3.0i with automatic transmission.

This oil cooler fits the following BMWs:
1992-1998 E36 BMW 318i 318is 318ti 323is 325i 325is 328i 328is M3
1993-1995 E34 BMW 525i 525i Wagon
1994-1995 E34 BMW 530i 530i Wagon
1996-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0ibr>

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OEM Rein Radiator Cap - E21 E24 E10 E12 E23 E28

2X Entries Into Our F80 M3 Sweepstakes

T#:7395

Part#: 17111100848

In Stock at Vendor

Sale - Save 5% $ 11.99

This product was last offered at the strikethrough price on
08-31-2026

$ 11.39 USD

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Sale - Save 5%

$ 11.99

This product was last offered at the strikethrough price on
08-31-2026

$ 11.39 USD

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The radiator tank cap keeps necessary pressure on your coolant to increase efficiency. If you have an overheating issue in your vehicle, a simple, quick, and inexpensive part to replace is this cap. Often times, the coolant is not kept under enough pressure to keep it from boiling or expanding too much. This cap keeps all the heat and liquid inside the coolant system for maximum efficiency. Should be replaced each time major coolant system service is performed.

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OEM Rein Radiator Coolant Cap

2X Entries Into Our F80 M3 Sweepstakes

T#:38161716

Part#: 92810625703

In Stock at Vendor

Sale - Save 7% $ 11.99

This product was last offered at the strikethrough price on
08-31-2026

$ 11.12 USD

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Sale - Save 7%

$ 11.99

This product was last offered at the strikethrough price on
08-31-2026

$ 11.12 USD

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Rein Automotive OE Quality caps are designed to be direct replacements for OE caps. Rein caps are designed to match or exceed the OE materials used and are produced to the highest standards to ensure long service life. Rein Automotive OE quality caps keep the coolant system at the proper pressure, just like the OE cap.

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BMS Heat Exchanger Upgrade - G-Chassis B58

T#:5095728

Part#: GCHASB58HEATEXCH

Ships on Sep 21, 2026

$ 480.00 USD

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$ 480.00 USD

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This heat exchanger upgrade is a high-quality replacement that dramatically lowers engine oil and water temperatures by providing a 50% larger cooling surface than OEM. The benefits are most noticed during back to back runs at higher boost levels where the factory cooling capacity can be overwhelmed resulting in ignition timing pull and reduced turbo efficiency. Direct bolt-in installation.

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Rein Radiator Mount

2X Entries Into Our F80 M3 Sweepstakes

T#:17804812

Part#: 17117575248

Ships in 4 Business Days

Sale - Save 5% $ 13.99

This product was last offered at the strikethrough price on
08-31-2026

$ 13.29 USD

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Sale - Save 5%

$ 13.99

This product was last offered at the strikethrough price on
08-31-2026

$ 13.29 USD

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Rein OE equivalent mounts are produced with high-quality materials to ensure maximum life and a smooth ride.

Module Bracket

2X Entries Into Our F80 M3 Sweepstakes

T#:639804

Part#: 17117575247

Ships in 4 Business Days

Sale - Save 5% $ 20.99

This product was last offered at the strikethrough price on
08-31-2026

$ 19.94 USD

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Sale - Save 5%

$ 20.99

This product was last offered at the strikethrough price on
08-31-2026

$ 19.94 USD

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This is the left side radiator bracket.

Radiator Support Bracket

2X Entries Into Our F80 M3 Sweepstakes

T#:14122755

Part#: 17117514402

Back Ordered

Sale - Save 13% $ 8.99

This product was last offered at the strikethrough price on
08-13-2026

$ 7.83 USD

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Sale - Save 13%

$ 8.99

This product was last offered at the strikethrough price on
08-13-2026

$ 7.83 USD

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Mounts to top of radiator bracket, 2 per vehicle.

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