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The "no fully synthetic" actually came from a Cummins service rep, which surprised me since the manual only specified viscosity and API rating. But as you said maybe synthetics weren't much of a consideration at the time it was manufactured. Good question. I don't have a way of externally...

Ha! Good stuff, thanks guys. Great info on this site. I'm a rookie here - what's the knock on synthetic? CalG, your point about advances in oil since 2004 make a lot of sense to me. Not sure why they'd suggest not to use synthetic, but that's about all I can find that's 5w30 diesel oil...

Hello, I have an 11.5kW diesel (Onan DNAD) genset that powers a small cabin. Made 2004-ish, has 7500 hours on it. I change the oil pretty religiously at intervals less than the 250 hours the manual calls for. I normally run 10w30 oil in winter, but have slow start ups when it gets real cold...