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Old 01-23-2020, 02:34 PM   #1
KCK71
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Default SL1 Oil Leak Question

First post on the forum. Have a 1995 SL1 (gold, of course) that has a 1997 engine. Car has 350K, engine was replaced at 200K but not sure how many miles it had at that point.

Anyway, the normal oil leakage has steadily increased to where I'm thinking the engine is now a 2-stroke engine, as it takes at least a quart per tank of gas or more. Still cheap to drive even running that much oil through it, but if I can solve the leak that would be good.

What would cause that much leakage but leave very little trace? It's not burning oil that I notice, nor does it puddle when parked. What are the usual suspects to check first, etc.?

Thanks for the help.

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Old 01-23-2020, 03:39 PM   #2
billr
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Default Re: SL1 Oil Leak Question

They all can suffer from oil getting past the oil-control rings and "burning" with no apparent effects; no fouled plugs or visible smoke, will pass smog test fine.

Another possibility is a problem with the PCV system.

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Old 01-30-2020, 09:21 PM   #3
grandamgt2k
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Default Re: SL1 Oil Leak Question

Try changing out the PCV valve, a quart of Lucas Oil and/or adding a bottle of AT-205 resealer to the engine oil.

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Old 01-31-2020, 12:36 AM   #4
me.theuser
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Default Re: SL1 Oil Leak Question

Quote:
Originally Posted by grandamgt2k View Post
adding a bottle of AT-205 resealer to the engine oil.
Stop leak products are never a good idea I doubt this one is any different..

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Old 02-01-2020, 12:15 AM   #5
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Default Re: SL1 Oil Leak Question

Quote:
Originally Posted by billr View Post
They all can suffer from oil getting past the oil-control rings and "burning" with no apparent effects; no fouled plugs or visible smoke, will pass smog test fine.

Another possibility is a problem with the PCV system.
^ ^ ^
Car will also drive fine with both

the other usual suspects are worn valve stem seals and a warped plastic cam /valve cover at the driver side rear.

...
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Old 02-15-2020, 02:39 AM   #6
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Default Re: SL1 Oil Leak Question

It should also be recognized that excessive oil consumption is a classic indication of immanent 'last days':
An engineer from Lotus had/has some text online explaining the connections between good honing, out-of-round cylinders, cylinder sealing, and expiration.

Compression and fuel consumption (mileage) are the two best overall indicators - like a Go/NoGo test for engines.

If the start readily, and get good mileage, they're RUNNERS !

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Old 02-15-2020, 04:07 AM   #7
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Default Re: SL1 Oil Leak Question

[QUOTE=me.theuser;2341118]Stop leak products are never a good idea I doubt this one is any different..[/QUOTE

YouTube automotive guru Scotty Kilmer has high regard for ATP AT-205. It is a good seal conditioner.

...
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https://www.ls1.com/forums/f48/been-testing-oil-91206/

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Last edited by NWSaturn247; 02-15-2020 at 04:12 AM..

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Old 02-15-2020, 10:57 AM   #8
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Default Re: SL1 Oil Leak Question

I am no fan of stop leak of any sort.

When your car got the engine swap, did it end up with a plastic or aluminum cover? If it is aluminum it is unlikely that is leaking.

I would also check the PVC valve as it is pretty easy to do.

A rebuild is a sure-fire way to fix it. Worked for me. My '99 does not use oil anymore.

Edit: auto or manual? Could also be the main seal.

...
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