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Old Jun 6, 2015 | 09:47 AM
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Default Oil leaks

I have an 02 WS6 LS1 it has 200k miles on it. Still runs great, doesn't smoke, it has had Mobile 1 Synthetic oil changed every 5k miles and starting to leak oil from what I can tell the rest main and possibly rear of intake. Is it worth it to pull engine and seal leaks and keep going? I would like to rebuild with higher performance but may be a few years before I am able to do that, my fear at this point is that the leaking oil ends up on exhaust and besides the burning smell I'm afraid of this causing a fire.
Any thoughts?

Earl
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Old Jun 6, 2015 | 10:36 AM
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It's not a hard thing to pull the intake off and check the condition of the valley cover just to rule that out and clean everything out real good. Go to Ls1howto.com and go to the ls6 valley cover tab to see how to pull the intake. I just did that this month and cleaned the intake and runners up real good and replaced all the gaskets.
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Old Jun 6, 2015 | 11:47 AM
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If it were only intake leaking I would do that for sure but its main seals also, like I said it had 200k miles on it
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Old Jun 6, 2015 | 11:52 AM
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Mines got 127k the oil pan leaks, probably rear main seal and maybe another place. Not even enough that it drips on the concrete but I know its there. I wont address it unless a new motor goes in. I think its pretty common.
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Old Jun 6, 2015 | 11:54 AM
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If its leaking that bad then degrease it and figure out where its coming from.
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Old Jun 6, 2015 | 01:58 PM
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Originally Posted by earls02ws6
I have an 02 WS6 LS1 it has 200k miles on it. Still runs great, doesn't smoke, it has had Mobile 1 Synthetic oil changed every 5k miles and starting to leak oil from what I can tell the rest main and possibly rear of intake. Is it worth it to pull engine and seal leaks and keep going? I would like to rebuild with higher performance but may be a few years before I am able to do that, my fear at this point is that the leaking oil ends up on exhaust and besides the burning smell I'm afraid of this causing a fire.
Any thoughts?

Earl
Can you reliably put new main seals in one with 200k and seal it up for another 50k miles? I know sealing the intake, oil pan etc won't be a problem.
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Old Jun 8, 2015 | 10:28 AM
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Originally Posted by earls02ws6
I have an 02 WS6 LS1 it has 200k miles on it. Still runs great, doesn't smoke, it has had Mobile 1 Synthetic oil changed every 5k miles and starting to leak oil from what I can tell the rest main and possibly rear of intake. Is it worth it to pull engine and seal leaks and keep going? I would like to rebuild with higher performance but may be a few years before I am able to do that, my fear at this point is that the leaking oil ends up on exhaust and besides the burning smell I'm afraid of this causing a fire.
Any thoughts?

Earl
Before you go too far, the top rear of the engine has two common leak points. Oil pressure sounding unit and cam position sensor. Need to remove intake to correct those. If you pull the intake, check the valley cover and those two sensors. Another common leak point is the crank angle sensor, which is just above the starter. You have to remove the stater to get to it.

Also, many times if it looks like your intake manifold is leaking, it is actually the PCV letting oil into your intake manifold. Best way to address this is when you're inspecting your valley cover gasket, just replace the cover with the LS6 cover, which has the PCV built into it. Many times it is still necessary to add a catch can as well.

Hope all that helps!
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Old Jun 9, 2015 | 03:17 AM
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Originally Posted by earls02ws6
Can you reliably put new main seals in one with 200k and seal it up for another 50k miles? I know sealing the intake, oil pan etc won't be a problem.
the rear main seal needs the transmission to be dropped to install it.

A pain but necessary on high mileage cars

oil pan is hard to because it's riveted to the pan and the kmember has to be partially dropped to replace it..

Most people wait until they do a converter/clutch install to do the rear main seal unless it's a major leak..

I would look for the leak and if it's an easy fix then go for it, if it's one of the above and not too bad I would wait until you mod it. Unless you do all the labor yourself it can be a very expensive fix at the dealer.

Also don't let just any shop work on it since theses engines have special alignment procedures/tools that are used to insure leak proof seals. I knew someone who had a rear main seal leak 2 times after letting a local shop fix it with no Ls experience..

I finally did it and it has never leaked again..

Good luck
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