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Old 09-07-2016, 10:27 AM   #11
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I love this forum. it's amazing the responses you get. I asked this same exact question about 5 weeks ago and got all the yes and no answers from the forum. I sent an inquiry to cummins about it and here is their response.

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We have the following response:
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Thank you for contacting Cummins Onan.

Even though your manual says that it is okay to use synthetic oil we do not recommend it. We have found that it gums up the cross hatches in the cylinders. You are okay to use any brand of oil as long as it is 15w40 w/detergent.

If you have any further technical questions please call us at 574-262-4611 and ask for our in house tech.

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Sincerely,
Cummins Onan Customer Service


so I guess the folks at cummins are as decisive about the topic as the forum members are.

which came first, the chicken or the egg?
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Old 09-07-2016, 10:51 AM   #12
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Quote:
Originally Posted by CHICKDOE View Post
I love this forum. it's amazing the responses you get. I asked this same exact question about 5 weeks ago and got all the yes and no answers from the forum. I sent an inquiry to cummins about it and here is their response.

-------------------------------
We have the following response:
-------------------------------

Thank you for contacting Cummins Onan.

Even though your manual says that it is okay to use synthetic oil we do not recommend it. We have found that it gums up the cross hatches in the cylinders. You are okay to use any brand of oil as long as it is 15w40 w/detergent.

If you have any further technical questions please call us at 574-262-4611 and ask for our in house tech.

----------------------------
Sincerely,
Cummins Onan Customer Service


so I guess the folks at cummins are as decisive about the topic as the forum members are.

which came first, the chicken or the egg?
Are they "Cummins" going to send you a "Revised Edition Manual"? I use Synthetic in ALL our Generators some are "Standby Emergency" they come on Automaticaly "Winter?Summer" The cylinders also have "Cross Hatches" the engines don't Smoke or have Low Compression! Youroo!!
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Old 09-07-2016, 11:03 AM   #13
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It's interesting on the different responses that people get. I was told that the synthetic was ok to use in my generator which is a RVQG3600LP. Which is what I inform Cummins when I wrote to them. So maybe that's different in some of their other generators?
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