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Alex;
It's safe! Smoke in exhaust and crankcase is due to blow-by (term for combustion gases sneaking by piston rings which are supposed to seal against bores and keep them from doing that)....tired engines , with their worn rings/bores have more, but there is another possibility. After prolonged storage, rings tend to bind up in the pistons causing poor sealing. I suggest pooring a thimble's worth of marvel mystery oil in each spark plug hole and letting it sit there for a week or while your working on your brakes etc. it really does work wonders.
Cheers
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