Why does my Mazda E2000 van smoke on startup?

My petrol Mazda E2000 panel van smokes on start up but this disappears after 20 minutes and nothing while driving. Had stem seals replaced but no better. Van starts and drives lovely and has done 160,000 miles.

Asked on 2 January 2017 by dave perry

Answered by Honest John
In that case, if oil is being used, it must be the piston oil rings. (It was sensible to start with valve stem oil rings.)
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