BMW E46 M3 S54 Engine Oil Cooling Upgrade by Mishimoto

Part number: MMOC-E46-01

Keep your S54 safe on spirited B-road runs and track days with this precision-engineered engine oil radiator from Mishimoto. This plug and play cooling solution is designed specifically for the 2001 to 2006 BMW M3 E46 and delivers a proven 30°F (16.7°C) drop in oil temperature while reducing restriction by around 10 psi versus the factory setup. Expect stronger heat rejection, more stable lubrication under sustained high RPM and greater confidence lap after lap.

We have fitted this assembly to our own cars and many customer builds. Feedback is consistent: lower temps, steadier oil pressure and repeatable performance on circuit, drift events and Nürburgring trips. It pairs with the standard radiator and also integrates neatly with the Mishimoto Performance Aluminium Radiator with no cutting or fabrication required.

Why this E46 M3 S54 oil cooling solution works

• Vehicle specific for 2001 to 2006 BMW M3 E46 S54 straight-six
• Real-world temperature reduction of 30°F (16.7°C) for track day reliability
• Approximately 10 psi less pressure loss than OE for healthier oil pressure at high load
• 110 percent thicker core for serious heat dissipation
• Increases oil capacity by 0.44 qt (0.42 L) to improve thermal stability
• Durable bar and plate core with one-piece billet end tanks TIG welded for maximum strength
• Stainless braided oil hoses with dash-10 AN (-10AN) swivel fittings for secure, leak-resistant connections
• CNC machined 6061 aluminium and 303 stainless fittings streamline installation
• Oil line stay included to protect hoses and keep routing tidy
• Compatible with the factory radiator and the Mishimoto Performance Aluminium Radiator
• Natural machined finish
• Backed by the Mishimoto Lifetime Warranty

Technical specifications

• Construction: Bar and plate
• Core thickness: 2.5 in
• Tank wall thickness: 0.16 in (4 mm)
• Additional oil volume: 0.44 qt (0.42 L)
• Measured temperature drop: 30°F (16.7°C)
• Overall dimensions: 26.1 in x 3.4 in x 4.3 in
• Core size: 23.62 in x 3.02 in
• Inlet and outlet: -10AN
• Installation torque: 10 ft-lb for the Oil Line Fitting Kit bolt

What you receive

• 1 x Mishimoto oil cooler with -10AN fittings
• 1 x BMW E46 oil line fitting kit by Mishimoto
• 1 x 1 ft 8 in stainless braided hose with 45° and 45° -10AN fittings
• 1 x 3 ft 5 in stainless braided hose with 45° and 90° -10AN fittings
• 1 x Mishimoto oil line stay in black
• 2 x M6 x 1.0 x 16 mm button head bolts for installation with the Mishimoto radiator
• Mishimoto Lifetime Warranty documentation

Vehicle compatibility

• Make and model: BMW M3
• Chassis: E46
• Years: 2001 to 2006
• Engine: S54

Fitment and installation

Direct bolt-on with the standard E46 M3 radiator or the Mishimoto Performance Aluminium Radiator. No trimming or fabrication required.

Want professional fitting in the UK? Book in with MJ Modifications in Warwickshire. Request a quote: info@mjmodifications.co.uk.

Compatibility check before dispatch

We verify compatibility before shipping. Add your UK registration or the last 7 digits of your VIN at checkout so we can confirm you receive the correct part for your E46 M3 S54.

Trusted by enthusiasts

Owners choose this Mishimoto engine oil cooler for dependable temperature control on fast road and circuit use. We have installed it ourselves and continue to see meaningful temperature reductions, stable pressure and excellent build quality. It is our recommended plug and play cooling upgrade for E46 M3 drivers who demand reliability and performance.

More information

Manufacturer: Mishimoto

Warranty: Mishimoto Lifetime Warranty

Notes

No modifications are required when pairing with the Mishimoto Performance Aluminium Radiator for the E46.

Video

BMW E46 M3 Oil Cooler Kit features and benefits

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