Genset - Quiet Ones
I have used synthetic oil only on my cars, never in a diesel application. On the cars (so far on 5 of them) - every oil gasket etc started leaking within 500 miles. Most leaks were fixed with a simple re-torque of the bolts. One car required all gaskets to be replaced (Porsche 911). Just be warned and keep a careful eye for leaks. What does the engine manufacturer say about syn oils?