It's no secret among 335 owners that while the cars perform admirably, they tend to run a bit on the warm side. This appears to be true even with the cars equipped with the factory oil cooler; and in case you weren't aware, not all 335s came with an oil cooler at all! For those who drive the cars in a spirited fashion on a regular basis, this issue is even more pronounced. While this is certainly a concern in stock form, it becomes even more of an issue when you consider increasing boost pressure, which in addition to added power output also generates more heat. And when you back your products with matching new car warranty coverage, including consequential damages, you tend to be a bit more concerned about the real world ramifications of increased turbo boost pressure on the car as a whole.

Recognizing the significance of this issue, Dinan set out to develop a more efficient heat exchanger, ultimately in the form of a High Capacity Oil Cooler. Two complete systems have been developed, one for vehicles that weren't equipped with a factory oil cooler and the other as an upgrade for the stock unit. Now every 335 driver has the opportunity to lower operating temperatures significantly, providing peace of mind as well as avoiding that notorious "limp" mode when things get simply too hot.

The Dinan High Capacity Oil Cooler provides literally twice the volume of the stock unit, as well as 414 sq./in. of cooling tube vs. 112.5, and that's really just the beginning. Nicely integrated inlet ducting provides greater airflow efficiencies and the ventilation of air to the fender well has also been improved with a larger outlet. The system mounts neatly in the stock location and includes lightweight PTFE hoses with polyester outer braid fitted with race-quality fittings. For cars that were not equipped with the factory oil cooler, kits are available that include all of the additional parts necessary for the installation. 

The results of the oil cooler upgrade are quite significant, with the temperature gauge holding steady even under high load/high boost scenarios. And for those of you who track their cars, even occasionally, the Dinan oil cooler is a must.

Specifications: Total Volume Stock: 9.5 oz. / Total Volume Dinan: 19 oz. Stock Surface Area: 45 sq./in. / Dinan Surface Area: 67.5 sq./in. Stock Cooling Tubes: 10 / Dinan Cooling Tubes: 23 Stock Tube Length: 90 in. / Dinan Tube Length: 207 in. Stock Tube Area: 112.5 sq./in. / Dinan Tube Area: 414 sq./in. 

Important Note: Some 335 Sedans were equipped with a longer fog light that will not clear the oil cooler. This type of lamp can be identified by the plastic lens (the more typical lens has a glass cover with a part number on it). In these cases, the right (passenger) side lamp will need to be replaced with BMW part no. 63 17 7 158 542, which is a direct replacement and easily clears the oil cooler. Only the right side requires replacement. Dinan stocks the replacement lamps if required.

A Premiere BMW Tuner

Founded in 1979, Dinan is well established as North America’s premiere BMW tuner. Dinan develops, manufactures and markets a comprehensive line of high performance products and systems, distributed through a nationwide network of Authorized Dinan BMW Performance Centers that includes select BMW Dealerships and Independent BMW Service/High Performance facilities.

Dinan’s industry leading warranty program, quality products and solid engineering have helped to make Dinan an almost household word among BMW driving enthusiasts. Road tests conducted by major automotive enthusiast publications over the last 30 years place Dinan enhanced BMWs on a performance level with some of the most exotic sports cars in the world. At the same time, Dinan BMWs are widely renowned for being civilized and reliable, providing a high performance BMW-like driving experience without equal.

Dinan’s comprehensive warranty program, introduced in 1996 with the cooperation of BMW of North America, provides BMW owners with matching coverage to that offered by BMW’s new car warranty, ensuring that Dinan performance enhancements and the BMW they have been installed in are covered for up to 4 years or 50,000 miles. BMW automobiles can now be performance-tuned without the associated concern of negatively affecting the new car warranty coverage, making the idea of enhanced driving fun and excitement appealing to a rapidly growing number of BMW drivers. In addition, Dinan Certified Pre-Owned high performance BMWs are now available through participating Dinan Authorized BMW Dealerships, offering matching warranty coverage to BMW's program.

Dinan is also now expanding its offerings to include the popular MINI models, providing the same attention to detail, solid engineering, warranty and performance that have made Dinan widely regarded as the top BMW tuner in North America.

Dinan offers a broad range of BMW performance products from engine, driveline and chassis tuning components to complete Dinan Signature Vehicles and special Factory Works programs. As a serious BMW Tuner, Dinan's objective is to offer complete performance solutions for the entire range of BMW models. We believe that every BMW driver deserves the opportunity to get the most from their car. From faster acceleration to improved cornering capabilites and stopping power, Dinan takes the guess-work out of creating the high performance BMW of the enthusiasts dreams with compete, balanced performance systems.