Dinan Auxiliary Oil Cooler / Engine Oil Radiator Kit for BMW 3 Series 335i N54 Twin-Turbo E90/E92 (2007–2010) – Upgrade & Retrofit for Cars Without Factory Oil Cooler – xDrive AWD Compatible – Performance Cooling, Track Day, Overheating Fix UK

Dinan Auxiliary Engine Oil Radiator Kit for BMW 3 Series 335i N54 - retrofit for cars without the OE cooler

Lower oil temperatures, protect your twin-turbo straight six and keep power consistent with this Dinan auxiliary engine oil radiator kit. Perfect for UK 3 Series owners running spirited B-road drives, fast road builds, remaps or regular track days, this high capacity heat exchanger adds the thermal headroom the N54 needs to stay sharp under sustained load.

Designed specifically for the 335i platform, this comprehensive retrofit solution replaces BMW’s missing factory lubrication cooling on cars that left the line without it. Expect noticeably cooler operating temps, more stable performance in hot weather and greater confidence when pushing hard. We have installed this package on customer cars and our own builds at MJ Modifications, and feedback has been consistently strong for both daily use and circuit work.

Key reasons enthusiasts choose this cooling package

• High efficiency air-to-oil heat exchanger tailored to the N54 engine for robust temperature control
• Helps prevent temperature-induced power reduction and limp mode during hard use
• Improves reliability on stock, remapped and hybrid-turbo applications
• Complete Dinan kit for vehicles that did not receive the factory oil radiator
• Proven on UK roads and track days with excellent customer feedback for consistency and peace of mind
• Ideal foundation alongside other cooling mods such as an uprated intercooler or radiator

Who is it for

Drivers who want dependable oil temperature management on N54-powered 335i builds, including fast road cars, stage 1 and stage 2 remaps, heavy motorway mileage, summer touring and open pit lane events. A smart reliability mod for anyone who has seen high oil temps, fade during repeated pulls or wants to protect bearings, turbos and oil viscosity under sustained load.

Vehicle compatibility

• BMW 3 Series 335i N54, E90 saloon and E92 coupe, 2007 to 2010
• Compatible with xDrive all-wheel drive models
• For vehicles that did not come with the original equipment oil cooler

If you are unsure whether your car originally had the OE lubrication cooler, please check before ordering or contact us for guidance.

Popular search terms

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Installation and support

Professional fitting recommended. MJ Modifications offers expert installation at our Warwickshire workshop. For a fitting quote or to confirm compatibility, email info@mjmodifications.co.uk.

Give your N54-powered 335i the cooling it deserves with Dinan’s auxiliary oil radiator kit. Enjoy cooler temps, consistent performance and the confidence to drive your E90 or E92 exactly how you intended.