Originally Posted by wil01
One of the advantages of using synthetic 5W-40 oil in any diesel is the better starting performance. My Cummins 5.9 doesn't have a block heater, but starts as soon as the key switch makes contact in +/- 15 degree temps.
My PowerTech generator has a Kubota engine with a pre-heat circuit. It starts just fine following the manufacturers recommendations with 5W-40 synthetic oil. The Onan diesel generator also uses a Kubota engine. I suspect it has a pre heat function as well.
I have been testing oil in diesel and gas engines since about 1994. Synthetic oil is really better and especially in low temperature situations.
I thought about switching to synthetic for the generator since it would be easier on it for a cold start. Next oil change I will but not going to crawl around under there now.
Haven't seen a winter like this in Southern IN since we've owned a motorhome (10 years) so I allowed myself to be lulled into thinking it won't be an issue.
Changing over to synthetic makes even more sense in that the generator is the backup for powering the house during power outages. Really don't want to have to worry about the generator not functioning in that situation.
Appreciate the info and help.