Still waiting on somebody to tell me what is a bad 15w 40 or 30W oil that meets all of the API specifications?
I think my genset only needed like a quart of oil, I will change every year and sometimes twice a year if I just want 30w over one summer.
We are talking about an Cummins Onan Generator. They have tried to tell everyone in the nicest way possible that there is NO reason (benefit) to use a Synthetic. This is akin to why some folks insist on putting a higher Octane gas in their Car when the Mfg has told them there is no need to, but some feel like they are doing their car a favor by spending more money. In some cases, spending more and makes it worse.
Now I do use fully synthetic in my cars, but that is what the books says. It is not that complicated. If you think about it, there is a REASON Cummins Onan is not endorsing Synthetic oils in their generator engines, and it is not because they didn't invest in Synthetic oil companies
So versus just saying out right
DO NOT USE, they simply say
THERE IS NO BENEFIT but that is not clear to all
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