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I have an X740 2012, bought used in 2017, approx 300 hours that has puff of black smoke at startup. I have used Opti-Lube XPD fuel treatment. Do I have anything I need to be concerned about?
Thanks,
Paul
 

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Many of these Yanmar diesels blow a puff of black or blue smoke at startup. That isn't unusual by any means. If you are concerned, make a video clip of it starting and post on the web so people can take a look and opine on whether your's is unusual in any way. :good2:
 

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It's a diesel,its normal.
 

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Ditto.

Will do the same thing when engaging the deck PTO. BTW do at idle.
 
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