Dinan High-Capacity Engine Oil Cooler Kit for BMW 3 Series 335i E90 (2006-2011 N54/N55) - Auxiliary Oil Radiator/Heat Exchanger Upgrade - Direct-Fit for Factory Oil Cooler & M Sport/M-Technic Bumper - Track Day Cooling/Overheating Fix Performance Bolt-On

Dinan high-capacity engine oil cooling package for BMW E90 335i N54 N55

Tackle rising oil temps on your E90 335i with the Dinan auxiliary oil radiator upgrade. This direct-fit cooling package is engineered for cars already fitted with the factory oil cooler and the Sport package front bumper cover, delivering serious temperature control for fast-road and circuit driving while keeping daily manners intact.

We run this hardware on our own builds and customer cars. Feedback has been consistently excellent, with noticeably lower operating temperatures, greater consistency under hard use, and more confidence lap after lap and on spirited drives.

Key advantages

• Twice the oil volume compared to the original equipment cooler for a larger thermal buffer.
• Massive 414 sq in of tube area versus 112.5 sq in stock for significantly increased heat rejection.
• Optimised airflow via moulded air guides and an enlarged outlet into the wheel arch to evacuate hot air efficiently.
• Neat, OE-style installation in the original location for a clean, factory look.
• Race-spec hose assemblies: lightweight convoluted PTFE lines with a durable polyester braid and high-quality fittings.
• Helps prevent temperature-induced power reduction during sustained load on road or track.
• Improves engine longevity by stabilising oil temperatures and maintaining viscosity under stress.

What is included

High-efficiency Dinan core with integrated ducting, pre-assembled PTFE hose assemblies, and premium fittings for a straightforward install. Designed specifically for vehicles already equipped with the OE oil cooler and the M Sport front bumper cover.

Compatibility

BMW 3 Series E90 335i saloon, 2006 to 2011, N54 and N55 engines, vehicles with the factory-fitted oil cooler and M Sport front bumper. If your car does not have the OE cooler or uses a non-M Sport bumper cover, alternative Dinan cooling solutions are available. Contact us and we will advise the correct option for your vehicle.

Fitting and support

Professional installation available at MJ Modifications in Warwickshire. Request a quote: info@mjmodifications.co.uk. We are happy to help with compatibility checks and setup for fast road or track use.

Why choose this cooling package for your 335i

If you push your N54 or N55 hard, sustained heat can quickly overwhelm the small OE heat exchanger. This Dinan system adds considerable cooling headroom, keeping temperatures in check during back-to-back pulls, long motorway stints, and extended circuit sessions. The direct-fit design preserves an OEM appearance while delivering serious performance gains in thermal management.

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