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.
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 convoluted 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.
- 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.
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.
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.
Special Note: Does not fit M-Technic bumper.