Randy101

I have a 2000 LS1 and I always find just one drop of oil on the garage floor when I pull the car out. I have replaced both valve cover gaskets and the oil pan gasket, but can't stop the leak so it has to be the rear main seal. I'm not about to pull my engine out for one drop of oil. Has anyone had any success with the stop leak products made (supposidly) specifically for rear main seals?

rboineau

Put a sheet of cardboard or whatever under the car to protect the floor and for monitoring purposes, then forget about it unless and until the leak gets worse.

Don't put those nasty stop-leak formulations in your car. If they plug up the leak--unlikely--they might also plug up necessary orifices.

routeman007

Just saw your post and had to reply. Got my coupe from a dealer who had placed mine on the back-row of his lot (before my purchasing it) because he was led to believe the rear main seal leaked. To make a long story short. The oil sending unit (located on top of motor behind the manifold), begun to leak and run a drop at a time down the back of the motor, which when landing on the floor, it landed right smack in the middle. I must say, "I got my coupe at a steal." (Big Smile) In your case,,, Could it be?

Randy101

I didn't know the sending unit was back there, thank you, that's where I'll look next.

Dave68

I'm not positive about this but it might be very hard to see without pulling the manifold.

2004c5blackcoupe

Try using a UV tracer leak detection dye and black light to pinpoint source of leak.

zesstey1

Cam sensor can leak and run down back of motor also.

routeman007

Go to YouTube (Located below) C5 oil sending unit replacement. It describes a 20 minuite proceedure. (That I have successfully done myself.) The unit runs around 35 dollars. Hope your leak turns out to be an easy fix. You've got us courious as to what it might be. Got to keep us posted now


Some helpful tips here:

http://www.youtube.com/watch?v=5PvlDLcyXX8

dezcapt51

Great video! Hope it stops my leak

TNX ZORA

Using an inspection mirror you should be able to clearly see wet oil around the OPS. If you do I wouldn't bother cleaning up any oil on the block until you replace it. If it is a properly installed, non-leaking sender you shouldn't see any wet oil reflecting light on top of the block where it's located.