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Oil all over my Undertray?

3.8K views 4 replies 5 participants last post by  Mugen_Zensou  
#1 · (Edited)
So I went to change my oil tonight to get ready for the CCEVO cruise tomorrow. Good thing, too! When I jacked the car up, I saw a bit of oil drip out from the undertray, and when I looked under the car, the bottom of the tray (the SSP one, so it was easy to see) was fairly slicked with oil from below the filter and all the way back. When I took the filter access port off the SSP panel, the bottom of it was covered enough to let a small run of oil drain out. Maybe an ounce.

At first I thought my diff pins cracked my xfer case. But the oil looked and smelled like engine oil.... hmm

First sanity-check: dipstick reading. It was reading right at the top FULL notch. So it didn't leak much, but its still a good coating.

Second check: look for the source by looking down from the top of the engine bay
Front of the engine bay was clean
-oil cooler area was clean
-turbo area looked clean from the top-down
-I noticed a bit of running from my catch can's glass window, but not much and there weren't any traces on the top of the trans, so it wasnt enough to be the culprit.
-PVC's all looked clean

Ok, I need to pull the tray to look under the car
-Again, xfer case looks fine. The bottom of the housing was covered, but it looks like it was blown back from somewhere in front -- the oil pan/filter area
-Also, the xfer case drain/fill plus didnt look to be leaking. All dry/clean besides some spray near the drain
-no oil high in the exhaust/turbo area, so I doubt it's a turbo feed/seal issue.
-oil pan drain area didnt seem to be an issue. Slicked, but not enough to drip
-nothing in front of the filter had any oil

looks like my oil filter was leaking? It took some a He-Man effort to get the filter off, so it wasn't too lose. Enough to actually crimp and break the filter with a chain-wrench. There was some residue build-on where the filter gasket meets the engine. Might that have been enough to cause it to leak? I cleaned it up real good before putting the new filter on, but there was a small ring of scaring from gunk spinning when I removing the old filter. Can over-tightening the filter endue leaking over time?

There weren't any oil spots where I park other than the drip spot that happened when I jakced the car up. I didn't notice any at my garage at work, either (although I didn't go back and look).

I'm pretty sure whatever happened has only been going on for a few days. I would have noticed spots in my garage.

Any idea what might have happened. I took a sample for Blackstone to send it just to be sure, but it was cold and near the end of the drain. Anything else I should check? I think I might have dodged a bullet, but I'd like to be sure :)
 
#2 ·
Hard to say but anything over hand tightening a spin on filter is not necessary. The gasket is thick and if it compresses too far the low tolerance filter housing (just a stamping, would be surprised if they held .01" across the board) could easily cause a leak. Everyone already knows this, but working in a little fresh oil with your finger is always a good idea, then hand tightening only. Oil filter wrenches are for off, never on.
 
#5 ·
those crush washers from the factory have a problem leaking if not replaced every time you change your oil, they are basically one time use deals. also, haven't really seen many people with too much luck on aftermarket filters either. not too much extra to just buy factory oil filters with the drain plug gaskets, better safe then sorry