Never used them engines before I don't get all wrapped in temps too many things can change that. Like running a M/T they tend to run very warm. I go by sound, smoke and reading the glow plug. The glow plug gives a better showing what is going on inside the engine. But smoke thing has changed alot since the most fuels are using syn oil now. That low oil content fuel which is better IMO all that extra oil tends to make them run warmer oil don't burn.