Oil leak?

[Bad324]

I've got an 07 LT with 4WD that I've noticed a couple spots in my driveway where I notice drops of oil. It's got 81,000 miles and I just bought it with78,500 on it

Are there "typical" spots with these that it could be coming from? Haven't had time to crawl up under there yet and looking to get a better idea before I do. Thanks in advance for any help!

 

[bb12]

Bump to this post...I have an 07 LTZ that just rolled over 48,000 miles. Noticed a very small drop of oil in the garage this morning on the drivers side. Haven't had a chance to look under it yet. Are there any TSBs for pan gaskets, etc?

 

[Bad324]

Bump?

 

[RossM]

Rear main seal and there is a spot above the oil filter prone to leak on these. My mechanic who works for GM fixed the leak above the oil filter. He said they are common. When I found the leak he knew exactly what it was.

 

[08grey]

I've got the above the oil filter one. Can you elaborate ?

 

[Yukoner1]

i have the same leak. Can someone elaborate and provide a fix?

thanks

 

[CrashTestDummy]

On our PPV, there is a housing that comes off the oil filter housing on the driver's side of the block. It's held on by two bolts. On the PPV, that housing is replaced by the oil cooler mounting bracket. There's a plug on the back side of that housing that's sealed by an o-ring. The o-ring started leaking right after we took delivery of our vehicle. Picture here:

I had to remove part of the torque converter cover so I could get that plug out, and replaced the o-ring with a viton o-ring (the green ones) used in A/C systems. So far, so good.

Without a cooler, I think there's just an aluminum housing there. It's sealed by a gasket that's held in position by the two bolts.

 

[denalianyone]

Where is the plug in this picture that you speak of


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[redemn93]

what he said ^^

 

[CrashTestDummy]

That's on the driver's side of the engine back by the transmission. Off of the lower left corner of that picture is the oil filter.

Remember, though, this is a PPV, which has an external oil cooler. Your truck may not have this block with the plug and lines coming off of it, but there IS a block of some sort that bolts to the side of the engine above the oil filter on these engines. Sometimes they have cooling lines coming off of them, sometimes an oil pressure sending unit, sometimes, it's just a block-off.

 

[redemn93]

we understand that part. what we want to know is where is the plug with the oring? lower left face of the block?

i have the cooler and lines on my denali. i think all 6.0 trucks have it. maybe all the 5.3 truck with towing package.

 

[CrashTestDummy]

Circled in the attached picture.

 

[denalianyone]

Where can I find this viton O-ring locally? And what size will I need? Thx you


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[CrashTestDummy]

You can get them at most autoparts stores. They're the green ones, that they usually keep in their assortment for air conditioning o-rings and seals. Sorry, I didn't get the size. Since the one on our truck was leaking, I already pulled it out, and headed to the parts store with the o-ring and plug.

We now have almost a year of nearly-daily-driving this thing, with no issues there.

 

[OR VietVet]

A parts store should just be able to look it up by application. You can look it up at Rock Auto.

 

[joshcarl]

hopefully it's that easy. the LS2s had an issue with blowing out rear main seals due to crappy PCV setups. luckily, mine held out long enough in my GTO for the clutch to need replacing too.

 

[denalianyone]

Ok thx


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[Addicted]

Same leak here (i think). It leaks pretty badly. I just pulled my oil cooler port cap off. (No cooler unfortunately).

The gasket looks fine, so I'm hoping this is where it is leaking. Thoughts?

Right stuff gasket sealer? I've had excellent results with it.

 

[Addicted]

Just ran across a receipt from the PO. This gasket was replaced at 136k miles (184k now).

 

[08grey]

I just got the same gasket for mine. Will oil come flashing out when I pull the cover off?