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Neo, ch427, thanks for the responses. I had a mechanic take a look - he observed the exhaust smoke and did a test drive and concluded it`s more than likely to be valve stem leaks. Whether replaceable in situ or not was gonna be a big job - 10-16 hours labourt plus parts, which I don`t want...

I`ve got a 1996 Rover sterling (2.5 v6 engine). Valve stem seals are leaking (it is blowing white smoke on first start up or after several hours stationary)which is going to cost more than the car is worth to repair. Has anyone got experience with using `Wynns engine stop leak` or any other...