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Just joined up, so hello all.
I bought a used 2000 S70 turbo from local dealership, but when I went for an independent inspection before buying, there was oil from the stem to stern under the car.
Long story short - they had replaced the oil return line gasket BEFORE I came along, but nobody cleaned the oil off the bottom of the car. They cleaned the bottom of the car, and it's been dry as a bone ever since.
In my brief experience learning about my new car, it would appear the oil return seals are fairly common in needing replacement. The oil on the bumper is telling me that the oil isn't going through the engine, but leaking out and down, and as you drive down the road, the oil is being blown and is sticking to the underside of the car (yes, all the way to the bumper).
Don't know how mechanical you are, or if you have some help, but I'd at least jack up the car and peek along the entire underside; is their oil all along it?
If so, note where it starts, and then clean off all the oil to start fresh. Drive 100 miles and look again, repeating until you see more oil coming down.
If it is starting at the back of the engine, like where the floor meets the engine compartment, I'd bet the gasket is still giving you a problem.
The original garage shouldn't have a problem looking under the car WITH YOU to discuss what you see and what they think it could be. Have them point out the gasket they replaced, and if there is no oil in front of that point, but plenty behind it, then that's your likely problem (unless the line itself is damaged)
http://www.ipdusa.com/ProductsCat.aspx?CategoryID=471&NodeID=179&RootID=629
Go into this second garage visit with this knowledge: it would appear the original and factory replacement gaskets are bright green when new. Even if yours are leaking, they might still have some green showing around the edges that looks newer than the rest of the car (mine were extremely obvious to see). Unfortunately, the only way to view them is to look under the car (AND DON'T DO THAT UNLESS ON PROPER JACKSTANDS OR IN A GARAGE WITH A HOIST - no jack-slipping accidents allowed here!)
Good Luck
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