Dear H3 owners, I am in a jam wondering if any one could help out.
I took the H3 to a transmission shop for oil leak, on and off for the past 3 months the truck has been in the shop.
The mechanic took the transmission on and off several times, use both factory and after market rear main seals, but it still leaks.

does anyone have experience on this? what parts should they use to fix the issue.

thank you so much

 

When you go through that much labor, never go cheap on the part. You failed to provide year, model and miles so my suggestion is limited to ACDelco OEM part done by a capable mechanic. The fellow doing your work may not be so capable?????

 

Hi, thanks for reply, sorry, year 2006, hummer h3, about 190k to 200k miles. thanks

 

Wrong seal used in my opinion . Go for ACDelco Parts and a better mechanic, if it's only the seal problem, he's done something wrong....

 

Did they verify the source? Oil leaks at the top of the engine appear to be a rear main leak underneath.
Get yourself a bottle of and

 

Hummerz has a great point. Also, can't high engine pressure (because of blocked PCV routes) cause this?

 

Yes, indeed.