Thor Forums

[chunker21]

Originally Posted by dkoldman

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

I think this subject has been beaten to death. Onan/Cummins has specific recommendations for servicing of the generators, both in frequency and equipment. If someone doesn't want to follow those manufacturer recommendations they are free to do so. Me, I figure that they, the manufacturer, know what they are dong and recommending so I follow those guidelines. I don't need to justify why I chose to, or not to, my choice. Every manufacturer also recommends their own branding of lubricants with the caveat of "or approved equivalent". Since we know Ford, Harley Davidson, Onan, etc., doesn't have their own refineries, using any of the properly API rated fluids works well.