[c_trak]

Hi.

I have a 2011 BMW 335 (N55) and noticed this slow leak coming from the oil transmission cooler/heat exchanger. Does anyone know if this can be taken apart so I can replace the gasket/seal? If so, can someone please share the part #.

Thank you for any of your input.

[StradaRedlands]

Yes, 100% a DIY job.
Here's the seal: https://www.fcpeuro.com/products/bmw...ng-11428637820

You'll want to replace the OFHG seal whilst there: https://www.fcpeuro.com/products/bmw...et-70-37157-00

And right below it the Mickey Mouse flange: https://www.fcpeuro.com/products/bmw...e-rein-chc0609

Also, if oil has been leaking on the accessory belt, replace it ASAP as well. Check tensioner and pulleys while doing that, you may want to R&R at the same time.

Sort of fun/rewarding jobs. Do it right now though, leaking oil onto the belt can lead to catastrophic engine failure. That's bad.

N55 engines should be primed for oil after you take the OFH off, so research that procedure as well.

Yes, it never ends...

[c_trak]

Thank you so much for your input! Will be tackling this asap!

[fastboatster]

there's no gasket available separately for TRANSMISSION oil cooler. https://www.fcpeuro.com/products/bmw...ng-11428637820 is for the ENGINE oil cooler

[c_trak]

I agree with you. After reviewing diagrams it seems that there isnt a separate gasket for the transmission oil cooler.

[darkfires102]

It's most likely not an oil leak but oil just seeping past your connection to the intercooler. It's normal.