I have ran synthetic oil in the generators for years to extend the run time between changes. Never an engine problem gas or diesel.
Our Polaris ATV's came with synthetic 0-40 oil way back when and later they went to 5-40 both which we changed oil at 200 hours as they sometimes had a harder life than the generators
The main difference in synthetic oil and fossil oil of the same grade is the uniform micron size of the molecules in the synthetic, if the Class is on the label matching your application go for it.
I also have run synthetic in all the vehicles and extended the change intervals as well. Always using a quality filter I might add. There is absolutely no need to change oil at the 3000 mile interval like a lot of the quick lube shops encourage you to do.
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