BMW E90 Oil Cooler Retrofit DIY

BMW E90 Oil Cooler Retrofit DIY

The early N54s in the 2007 335i didn’t come with oil coolers installed from the factory. In this video, I’m gonna show you how to retrofit one. The oil temp seems to be running about 10F cooler since I did this. Enjoy the video!

Parts List For E90 N54 Oil Cooler Upgrade:

11428642289 Oil Filter Housing With Cap
11428637821 Oil Filter Housing Gasket
11427573212 Oil Cooler Thermostat Housing With Thermostat
11428637820 Oil Cooler Gasket

17227521376 Oil Cooler
17217540030 Plastic Holder for smaller Oil Cooler Bolt
07147144953 Hex nut for oil cooler to body bracket (x2)
07119903995 Small Hex bolt for oil cooler bracket

51717162272 Air Duct For Oil Cooler, front right
07119905241 Screws for holding air duct to oil cooler (x3)

17227567207 Engine oil cooler pipe, flow
17227567208 Engine oil cooler pipe, return
17227555715 Screw for oil cooler lines (x2)
17222245358 O-rings for oil cooler lines (x4)
64216904030 Plastic clamp for oil cooler lines

51647154546 Front Bumper Carrier Bracket, Right
51717162276 Fender Liner – Right
51717161436 Oil Cooler Grille For Fender Liner – Right
51747160610 Air Duct Next To Oil Cooler Duct, Front Right
51117134080 Bumper grid, fully open, right

Here is the sport oil cooler “valve” (looks like it just bypasses the thermostat and lets the oil run through the cooler full time):

This is the upgraded “mickey mouse” flange (video on this coming next week):

This video is for entertainment purposes only. 50sKid assumes no liability for any repairs or modifications performed by the viewer as a result of the information contained in this video.



Sean Paul says:

BMW SIB clearly states

After making engine repairs that require the replacement or removal of the engine bearings, VANOS gears, camshafts, bed plate resealing, engine oil pump, engine oil filter housing, cylinder head, engine oil cooler or anything that interrupts the engine oil supply circuit of the engine requires a short oil pump and oil supply circuit priming procedure.

robbiek5oh says:

I’d change the thermostat and get the temps down closer to 200; oil gets pretty thin when it’s smoking hot (240+); enjoyed the video

Sean Paul says:

Here is the link

After replacing anything which disturbs the oil circuit, an oil prime is required before starting the engine properly.

Sean Paul says:

You messed up. There is a BMW service information bulletin in regard to this. THE OIL CIRCUIT MUST BE PRIMED BEFORE STARTING ENGINE !

I can dig out a link for you.

There have been many examples of permanent engine damage shorly after not doing this procedure. Many engines had to be replaced by BMW.

Jay Parnes says:

Big job and nice work! FYI it's always a good idea to oil prime the engine when you're breaking the oil circuit as you did. Either pull the fuel pump fuse or remove the connectors from each fuel injector.

Stephane Louvet says:

Nice job ! Very detailed, as always. Many many thanks.
It's so cool to see how all the front parts are assembled together !
I'd like to realign my front bumper (on E92 335i N55, which has already this additional oil cooler) as it shows a bigger gap at the top, near the bonnet.
I can't tell you about the oil temperature as it's my first BMW and have no reference point.
But I noticed it's changing with the drive. Oil runs warmer on stabilized speed on the highway and gets cooler when driving aggressively on twisting roads.
I've been told it runs warmer for fuel economy and cooler to improve the cylinder compression when "performance mode" is detected.

22:11 – When reinstalling the oil filter housing, are you placing new screws ?
How much oil will it be in the circuit with the added oil cooler and lines ?
29:57 – Those headlights need a refreshment 😉

fallos oK says:

Is there any reason you didnt go with an aftermarket cooler (besides price) ? Most aftermarket coolers offer better cooling than the stock, and can run upgraded AN lines

GreyBeard says:

Which is better for work like this..impact wrench, or impact driver?

Hamkaastosti1 says:

I just recently did this retrofit, however I did not have the black bracket. My radiator is bolted to the frame rail and the radiator air duct. It seems sturdy enough and can’t really go anywhere. I did not remove the front bumper for this job.

I have the M bumper, there probably is a part for the fog light assembly to allow air in, but I just used the dremel to cut out the hole to the air duct.

If you buy new, the air duct for the brakes (€30 ish) is way cheaper then the air duct for the radiator. (About €130)

I also installed the Mosselman N54 thermostat. Now temps are on 100 degrees celcius instead of 120

jhncvngh says:


Eric Dawson says:

I'm going to be doing this on my E82 (with an N52) soon-ish. This is making me want to put the job off even more. lol

Good vid though. Haven't seen anything as comprehensive as this.

michael blacktree says:

Great video! I'm looking to do the same with my E46. But I think it would need an OFH from an M3?

Leo Nolazco says:

Like always good info and video thanks 50skid

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