Small O ring in Oil Filter
Deceased
Joined: 06-30-2010
Posts: 25,739
From: Kannapolis NC
As far as I understand the small o-ring makes a seal on that end of the filter for proper routing of the oil flow, if its missing the oil can bypass the filter. I'm sure someone has delved deeply into the Ecotec oiling system and can give an exact why and wherefore, but for now the simplest answer is that it needs to be there.
Platinum Member
Joined: 01-09-2007
Posts: 16,081
From: SE USA
As My wife says Iam a NUT anal ass I wasn't sure about the small O ring and went out and pulled the oil filter at 2 am
to be sure things were right . I just didn't remeber seeing the small O ring when I changed it a few weeks ago . so I had to look only been drove a couple 100 miles so would not a been a big deal but all was right it was there now I can sleep .
As as been posted by many already the small o-ring has to seal off incoming oil, so the oil gets filtered.
Member
Joined: 05-06-2011
Posts: 76
From: Michigan
so seeing me out at 2am with parts off a new car and the hood up no one thought a thing about it ! Just the nut across the street . Same guy that details his cars all the time and blows them dry with a gas blower . I really could not sleep until I knew forsure it was on that damn filter 
Ya I agree and it must need to be there or GM would not spend the 1 penny or less they cost on OEM filter
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