It can be, and that occurs intermittently on my coach. If it is really dense, that is not a good sign. If its a little and it is intermittent, then I dont think it is usually a big deal. Mine is a blue puff when the engine first fires like it is residual oil in the cylinder. If it continues while its running, that suggests oil somehow getting into the cylinders or a bad mixture of fuel and oxygen when burning.
Gary
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Gary and Dee, Zowie and Bowie (traveling cat sibs)
2019 Cornerstone 45B, X15-605hp, Imperial, Spartan K3,
2013 Honda CR-V toad, Demco Excali-Bar II,
Demco Baseplate, Demco Toad Light system, 73 de W5FI
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