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Oil leak, Part II

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Thanks for the feedback about my suspected RMS leak, especially Toolpants. (Recap: After my car sat for several days, a small pool of oil was discovered on the passenger side, immediately ahead of the rear tire, flowing over from just inboard from the pool.)

I got the car up on a lift today and poked around a bit. Having pretty much ruled out the RMS leaking oil, the it was the valve cover that could have been leaking oil. (I have been told that the valve cover leak is not uncommon.) The only place that I could see any oil leaking out of was the oil pressure sending unit. There was no oil at all on the side of the engine from the valve cover. I would guess that if the valve cover was leaking oil that I should be able to actually see it running down the side of the engine but I saw nothing. The oil around the sending unit looked quite fresh and clean. There wasn't much but there was a think, shiny film of fresh oil. (Sorry, no pics due to a technical glitch.)

What I am wondering is whether this is a common thing. I hear that it is common on BMW's. Has anyone seen this? Any opinions?

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