Well, after years of trouble free driving my 850 has sprung a leak. It's engine oil with two or three quarter sized drops appearing over-night in the garage. Coincidently, it started the day after I "topped-up" the oil. thinking maybe some dripped down the engine I kept an eye on it. Well, it's been one week and definately there is a leak. I have always preached the importance of cleaning the flame trap etc, to avoid excess pressure resulting in a rear engine seal blowing...this is my worst fear. Can anyone suggest other places to look? Was adding oil to just above the fill line (which in my opinion shouldn't matter)had anything to do with it? The car is going up a hoist at the end of the month for fluid changes, I'll have a look then but in the meantime appreciate any comments.