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I've said it before many times. You need to drive under load to get the rings to reseat again. Diesels can get the cylinders "glazed" if they have "wet stacked". If your not making them work all diesels will eventually wet stack. Most people just think generators are the only ones wet stacking. They are just the most common. The compression rings are designed to "push out" when under compression. If there is not enough load, the cylinders basically get washed down and like "wet sanding" a paint job put a smooth finish on the cylinder walls. So like your mechanic told you, take it out and drive it hard !I also noticed mine blows blue smoke when I start her up after she sat for a while (several weeks sometimes).
Advice from the mechanic who worked on my 1987 Mercedes with a diesel engine: "Drive her like you stole her." And even though I have no experience driving stolen cars, after some aggressive driving (as aggressive as you can get with an old diesel) the blue smoke disappeared. I see no reason why the mechanic's advice wouldn't also apply to the multifuel engine.
This guy forgot one other thing that causes White smoke. Coolant in the combustion chamber. Otherwise a good article.
Yes, if your turbo seal is leaking bad enough on the exhaust side it will cause oil to build up on your entire exhaust system. You will also see oil dripping down your exhaust pipe. Whenever we see a muffler that has oil coming out we always check the turbo.
