Hi thom4782.....I agree.....it is indeed a mystery! Especially as I believed the original coolant level to be well inside the min - max margins before the warning light first came on last week. However, I was only trying to peer through the opaque coolant tank and might just have misread the true situation. Since I brought the car back on Saturday, I've been looking into the top of the coolant tank at the coolant level itself which is just above the white opaque body of the tank, so I'm getting a more accurate reading now. I guess only time will tell because if the coolant is seeping through into the engine through a crack in the cylinder head or a damaged gasket, then the oil level will start to go up again over the next few days. I shall be keeping an eye on this and will repost my findings by the end of the week.
Just to confirm for Byprodriver and trimer, .....the coolant cap on my car is blue and is marked with o4 and it has the Porsche triangle trade mark. The mechanic said that he had fitted it during it's last service in September 2012.
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