Went out to check the car over after the Nachtrit. Does anyone know how much oil it takes to top up a 4 pot engine from the low mark to the high mark on the dipstick? Whatever it is, the Spitfire used that much driving the 300 miles back from Holland on Sunday, so I guess it's time to dig out the Ford Pinto valve stem seals that I bought last year and have not yet fitted. It's been getting worse since the 10CR and I'm pretty sure its coming down the inlet valves. I'll fit these, without taking the head off, use some Jaguar XJ single springs (the doubles won't fit with the Pinto seals) and see how it goes. If it's not this, then it's going to need a bit more than just the bottom end refresh I was planning for after Christmas :(