Yes ... well ... sort of.
I recall a similar thing with "Rainx" ( the stuff you put on your window so that rain justs beads off and you practically don't need the wipers). Manufacturers didn't recommend it but ... why exactly?
A great product however for steady, normal rains and even helped in heavy downpours. Weighing these factors, I choose not to use it.
Now, in the case of DuraLube
The meaning of this is that oil in the cylinder was evaporating after being stopped for awhile ... then on start it partially burned that oil and sent it out the exhaust as a cloud of smoke. If the engine cranked over ... that oil was exhausted without burn and the next firing was clean gas. This is the only explanation which fits the observations.
Why blame the DuraLube?Because the DuraLube replaces regular oil on metallic surfaces. To do so, presumably (and undoubtedly) it repels the oil to some degree necessary to replace it since oil also "wets" metal (obviously ... if it repelled metal it would be useless as a lubricant). This could be tested by mixing DuraLube and oil and seeing if they separate like water & oil ... I presume that they would.
Now ... the oil & DuraLube are churned up in the engine and coat the walls of the cylinder. When I'm running I'm burning some oil but not enough to notice (I burn about a quart every 600 miles or so). With the engine stopped, the oil starts to separate out from the DuraLube on the cylinder wall ... and beads up.
Well I've had this stuff in my car for over a year and ... it has run virtually without oil when I forgot to put in more ... but ... well, I "smoked" a couple next to me just yesterday and was very embarrassed. And people look at me "funny" when I start ...
Hi hohhh ... Silvahhhhhh!