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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Oil cooler on N52

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      05-31-2013, 10:32 AM   #45
tuned n dropped 335xi

Drives: '09 335i Xdrive e90
Join Date: Sep 2011
Location: Dayton, Ohio

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I have been doing research in adding an oil cooler to my SPORT PKG 335xi that did not come with one, for whatever reason...

This picture helps. Factory without an oil cooler does not allow the thermostat housing to be added, as you can see in the picture. You do need a new OEM oil filter housing that allows for the thermostat to be added. This is ~300 from Stett, I bet you can get it cheaper eslewhere.

If you have an OEM oil cooler, some kits come with a new thermostat that bolts to the special oil filter housing. But you DO need a new housing if you do not have a factory cooler. The oil filter housing w/ thermostat access is part 7 in the diagram above. Notice how the non oil cooled does not have that opening or mounting points on the filter housing.

Here is a DIY to upgrading the oil cooler from a non oil cooled engine. The first few picutres really show what is different on the oil filter housings.

335xi - BMS DCI - VRSF DP's - JB4 Tune - KW v1 -
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      05-31-2013, 10:59 AM   #46
Freight Dawg
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Drives: E90 325i
Join Date: Jul 2005
Location: Oakland, CA

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I always thought that the part highlighted in yellow was just a distribution block. The stett oil cooler doesn't use that half of the housing. They have their own distribution block and a separate thermostat downstream.
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here! | Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors
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