My car has a constant whiff of white smoke too. Smells of diesel as well. One day I will probably buy a leakdown tester and get to the bottom of it. No blowby in the engine, so it could just be bad timing. But I really won't know till then.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.