Is it the rear main???

[blazzinbird]

so we have been loosing oil for a while 1qt every few weeks. There is oil on the bell housing behind the motor. So rear main most likely, but I’ve read if the pcv valve is bad it can cause oil to be pushed out the rear main. Is this correct?

 

[swathdiver]

Not sure about that one. But oil can come from the oil pressure sensor and drip down making it look like a rear main leak.

 

[Tonyrodz]

so we have been loosing oil for a while 1qt every few weeks. There is oil on the bell housing behind the motor. So rear main most likely, but I’ve read if the pcv valve is bad it can cause oil to be pushed out the rear main. Is this correct?

If that's an idea--pcvs are cheap enough to give it a shot, or even try to clean yours out. Take it off and shake it. You should hear a ball moving around. If not, hit it with carb cleaner until you do.

 

[blazzinbird]

This is a 08 6.2l

I’ve just read they may not have a rattle pcv.

 

[Tonyrodz]

This is a 08 6.2l

I’ve just read they may not have a rattle pcv.

Ahh, I think you're right. Probably built into the vc.

 

[donjetman]

Here's the thread I started when I decided to replace the rear main seal.

https://www.tahoeyukonforum.com/threads/rear-main-seal-job-pan-etc-07-yukon-denali-6-2.108334/

Here's the thread I started when I changed the valve cover to the new and improved one.

https://www.tahoeyukonforum.com/threads/valve-cover-change-cleanup.108604/

There's a technical service bulletin TSB# 10-60-01-008M you might be interested in?

https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf

Here's a thread I started on valve covers, oil deflector, oil consumption etc.

https://www.tahoeyukonforum.com/thr...tor-oil-consumption-tsb-10-60-10-008m.108493/

 

[JML07denali]

so we have been loosing oil for a while 1qt every few weeks. There is oil on the bell housing behind the motor. So rear main most likely, but I’ve read if the pcv valve is bad it can cause oil to be pushed out the rear main. Is this correct?

Sounds just like my symptoms. Ended up just dropping $1,300 on the rear main seal. Wish I had better news!


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[Sugai]

so we have been loosing oil for a while 1qt every few weeks. There is oil on the bell housing behind the motor. So rear main most likely, but I’ve read if the pcv valve is bad it can cause oil to be pushed out the rear main. Is this correct?

Have an 2003 tahoe 2 wheel drive, thought was PCV, wrong rear main seal was the Culprit