Oil Leaks On 2007 L76 6.0 Engines

VMax2007 · August 30, 2007

Well, here's the story on my first "issue" requiring a warranty repair on my new truck. I have heard this is somewhat common on the NBS 6.0's. Just looking for more expert opinions...

About 2-3 weeks ago, I was poking around under my truck and I noticed a few small drops of oil on the bottom of my engine near the Tranny bell housing, near the oil filter and also near the starter motor. Not much, not even enough that it dripped on my floor, but enough for me to notice. I wiped it off and called the dealer to see if they any info/insight on this and to see if it was common or not. I decided to wait and keep an eye on it and see if it reappeared after wiping it off. Well, on Monday, I crawled under it again and sure enough, it reappeared. So I called the dealer and made an appt. I brought it in this morning and they called me at 3:00 to tell me it was all fixed. They replaced the oil pan gasket and the gasket for the manifold where the oil cooling lines enter the block.

My question is: Has anyone (GM Techs) seen this on these engines? Is it a fluke or a somewhat common issue? Any TSB's related to oil leaks?

Thanks!

Mighty HD · August 31, 2007

I had the same problem several times with my 04.

VMax2007 · September 4, 2007

Update:

The oil leak is not fixed. I now suspect the rear main seal. It's going back in next Monday. I'll post an update when I know more.

JumpMaster · September 8, 2007

I just got my 2007 Silverado back today for the 2nd time. The first time they called it a Valve cover leak. After 2 days it showed up agian in the same location as yours. After 4 days of dealing with arental I got my truck back. I hope it is fixed this time.

JumpMaster

Ft Campbell