2008 535i leaking oil cooler
#11
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Since this is bothering me too much, I started looking at it again, wiped the whole area as much as I can and this time I kept the engine idling while I kept monitoring the area for leaks. I started noticing a very little seepage from the bottom screw of the thermostat cap (this is with the new o-ring installed) and I didnt see any seepage from the hose connections to the housing, but I did notice leakage at the out flow (short) hose compression fittings. You can see it in this picture. I am sure over time this must be leaking a lot at higher rpms when the oil pressure is higher. Will order a new short hose (17227560980) and replace it for now and continue monitoring it. But I am out of ideas on the thermostat cap, should I spend ~$45 to get one of those aftermarket thermostat cap (FTP cover) or spend $120 to get a new cooler housing(11427573212)?
#12
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Join Date: Jul 2011
Location: Augusta, GA
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My Ride: 05 530i M54
Model Year: 05 530i
Engine: 3.0 M54
When mine was leaking I bought the whole assembly. Looks like you also need to replace the hose. I would do it it pairs. I'm sure the gaskets were not thick enough or torque is not correct when you tightened it back up. Let us know what you decide.
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pavjayt (06-05-2021)
#14
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Replaced the short (return) hose and went for errands drive and the weather is quite hot over here. Came home and checked for the leak and there is no leak anywhere at this location. BUT, one thing that is still bothering me is a very very little seepage at the thermostat cover. Replaced that O-ring as well with a thicker one, but looks like hot oil is always finding its way out. This is fine for now as I can wipe it off up after few drives. Probably have to go with one of those aftermarket covers that come with a new gasket.
$160 for a hose is a rip-off anyways.
$160 for a hose is a rip-off anyways.
#15
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Your reply reminds me of when I was having issues with my e36 thermostat cover leaking. I tried everything under to sun, new cover, gaskets etc etc. I finally gave up and took it to my indy mechanic. He fixed it. I asked what was the problem? He said I didn't have the housing clean enough. All he did was clean it. Hmm. It looked super clean to me, but I since learned from other people that it needs to be pristine clean. One guy said to scrape my finger nail on it, and if I feel anything, its not clean enough.
#16
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Your reply reminds me of when I was having issues with my e36 thermostat cover leaking. I tried everything under to sun, new cover, gaskets etc etc. I finally gave up and took it to my indy mechanic. He fixed it. I asked what was the problem? He said I didn't have the housing clean enough. All he did was clean it. Hmm. It looked super clean to me, but I since learned from other people that it needs to be pristine clean. One guy said to scrape my finger nail on it, and if I feel anything, its not clean enough.
#18
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#19
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