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Only blue smoke if there is more oil,we are talking about a drop or sweating,it is so little I don't thing you will see this on a compress test.

If the exhaust billows white smoke for a few seconds when first starting the engine after it has been sitting for a while, such as overnight, and then runs normally, it could mean that the rubber valve stem seals have perished - especially if the vehicle is a few years old It must be something like this or in a very rare cases one of the valve guide. had it ones with a 2.5 diesel (78000km) and ones with 300tdi (127000km) i have seen you list of work done and there is not much left,

is it still possible to have a copy of the workshop manual and Maintenance Schedule of the 2.4 puma