Rear main puking oil?

[Jones7605]

Wouldn’t you know it. I’ve had the car all of three days. I’ve noticed if I run the car fairly hard I’m seeing oil on my drive way. Looks like the rear main area. Normal driving and nothing shows. Any ideas? 2011 ZR1.

Picture for attention it’s not that big.

[32valvesftw]

Are you sure its not coming from up above and tracking down? There some oil leak areas like one of the header bolts that goes into an oil gallery, or the back of a cam cover. When I got mine I had a similar leak, and retorquing the oil pan bolts cured it for the past few years. The tech solutions part of this forum discusses most of the common oil leak areas. There is also Crossed Flags Performance in Magnolia/Tomball, Steve and his crew can fix you up in any case.

[Hib Halverson]

My '19 had a defective rear main seal which was replaced under warranty.

If the rear main is bad, there will be oil weeping from the part line between the clutch housing and the block.

It's unusual for one-piece rear seals to leak, but it happens.

[Jagdpanzer]

Reminds me of my old high school buddy’s 650 Triumph Bonneville.
He claimed it was just marking its territory.


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[Jagdpanzer]

Probably sometime leaking up in the valley making it way down the drain tube.


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[Jagdpanzer]

I’m with Hib. Unusual to see one piece rear main seal leak that bad.


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[billschroeder5842]

Probably sometime leaking up in the valley making it way down the drain tube.

That's my guess. I had a leak (not that bad) coming from the drain tube behind the oil pan. I took off the plenum and retighten the PCV crankcase baffle.

No issues since

[tccrab]

I think he's got the wrong forum, the airdam on the pic looks to be a C6 not a C4.
His signature might be a clue too.....

'Crabs

[A26B]

I think he's got the wrong forum, the airdam on the pic looks to be a C6 not a C4.
His signature might be a clue too.....

'Crabs

and..... his post says 2011 ZR1

[Ccmano]

All ZR1s are welcome here. I’m thinking maybe we should establish separate C6 and C7 ZR1 sections here on the forum. Thoughts?
H
:cheers:

[Jones7605]

There’s one in every forum. Check the VIN, car 514. On another matter it was the rear main seal. Tore it apart today.

[tf95ZR1]

All ZR1s are welcome here. I’m thinking maybe we should establish separate C6 and C7 ZR1 sections here on the forum. Thoughts?
H
:cheers:

Hans, the plan is to discuss this again at our next Board meeting, as well as other Forum topics!

Ted

[DRM500RUBYZR-1]

There’s one in every forum. Check the VIN, car 514. On another matter it was the rear main seal. Tore it apart today.

After three days?
That stinks.
Guess the seller "forgot" to mention that detail.
What is the mileage on the car?
Welcome!
:cheers:
Marty

[A26B]

All ZR1s are welcome here. I’m thinking maybe we should establish separate C6 and C7 ZR1 sections here on the forum. Thoughts?
H
:cheers:

I agree. I apparently missed the announcement that our C6 & C7 bretheren
would be joining us. Glad to have them.

For their benefit, I think a separate section would be appropriate in General, Technical & For Sale would be helpful. example C4 ZR-1 Technical Postings, C6 ZR1 Technical Postings & C7 ZR1 Technical Postings.

[WARP TEN]

I agree. I apparently missed the announcement that our C6 & C7 bretheren
would be joining us. Glad to have them.

For their benefit, I think a separate section would be appropriate in General, Technical & For Sale would be helpful. example C4 ZR-1 Technical Postings, C6 ZR1 Technical Postings & C7 ZR1 Technical Postings.

I agree with Hans and Jerry. Good idea for everyone, including the ZR1 Net Registry's income statement.--Bob

[S.hafsmo]

If other Z's are to be included, please make sure they are properly separated in all topics/genres. C4 Z-related posts will drown, I assure you. But as long as there's still a "today's posts" which only contains C4-related topics, I'll keep my complaints to an absolute minimum.

[spork2367]

If other Z's are to be included, please make sure they are properly separated in all topics/genres. C4 Z-related posts will drown, I assure you. But as long as there's still a "today's posts" which only contains C4-related topics, I'll keep my complaints to an absolute minimum.

I agree with this. I'm not sure other z's are a fantastic fit being that the entire theme of the website and forum is c4 zr-1. We'll end up with essentially a duplicate website.

[DRM500RUBYZR-1]

"It's deja vu, all over again. "
Yogi Berra

:cheers:
Marty

[32valvesftw]

To me the allure of this forum is its specificity to the C4 ZR-1 and it's unique attributes.

[Marc Haibeck]

I'm guessing that the rear main seal, which is the most difficult item to replace is also the least likely cause. Here is what I would look for:

- Is the oil level too high? Check it 10 minutes after shutting the engine off. *Not* before starting it cold.
- The oil cooler is back there. Leaky connection? It's easy to service.
- The hoses to and from the dry sump tank are back there. Road damage?
- Loose oil filter?

I hope that you get lucky.

BTW Hib. Did you install your rear main seal?:)

[Neat]

Around those years, the rear covers on LS engines had a casting porosity issue, the oil would ocassionally wick through the aluminum rear cover. I have only encountered the issue on 2010 and 2011 Camaro's, but I don't know why the issue would be confined to F-bodies.

There is an updated part number from GM that comes with a new rear cover, with the rear main seal installed, and new bolts. The last one I bought was about $55 from the local dealer. Easy to install, a pain to get to. Good luck!