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Old 02-20-2019, 02:37 PM   #1
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Generator oil change?

Yes, I searched the forums to see if this has been posted and perhaps it has, but I was unwilling to go through the 546 pages of posts to find it!

Our Greyhawk is a little beyond one year, purchased just before Christmas in 2017. We have used the generator sparingly, never longer than maybe 30 minutes and usually just to keep the A/C on while parking, setting up, etc.

Not sure how many hours but can't be that many (and I am at work, not near the rig).

When I checked the oil two weeks ago, it still looks pretty pristine (not dark at all), but surely after at least 14 months, and how knows how long it sat on the dealer lot, it should be changed out, right?

We are about to take it out in two weeks for our first weekend trip this year.

Any have any advice, suggestions, obscure references they want to submit?!

Thanks in advance.
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Old 02-20-2019, 03:25 PM   #2
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While the oil may look good, it can still contain quite a few contaminant that are bad for the engine. Moisture can build up in the oil along with acids that will eat up the insides. My philosophy is run the engine regularly and when you do get it good and hot.



When I had my plane, my mechanic swore by running it often and letting it build some real heat to help boil off the contaminants.



No real data to back this up with...
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Old 02-20-2019, 03:47 PM   #3
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I would change it for peace of mind. Its inexpensive to do verse having your generator crap out.
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Old 02-20-2019, 03:52 PM   #4
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We change ours at least once a year regardless of miles or hours as recommended by most engine manufacturers.
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Old 02-20-2019, 04:31 PM   #5
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Personally I use synthetic oil in all of my engines, it's better oil and it since it's made from natural gas the residual sulfur is considerably less. This residual sulfur combines with water to form sulfuric acid in the oil. As the a previous poster stated you need to run your generator periodically and get it up to full operating temperature and keep it there or a while. This is what boils off the water. Just periodically starting the engine only letting it run for a few minutes is worse the not starting it at all as the combustion creates water vapor and it get in the oil but the engine doesn't get hot enough to evaporate it. This might be helpful: Oil Degradation. Ya I know it's from England but it's still good information.
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Old 02-20-2019, 04:36 PM   #6
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Oil degrades with time. I would change it two or three times a year whether you use it much or not.
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Old 02-20-2019, 05:17 PM   #7
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According to the Onan manual, “change oil at least once a year.”
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Old 02-21-2019, 08:13 AM   #8
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Quote:
Originally Posted by Click_here View Post
When I checked the oil two weeks ago, it still looks pretty pristine (not dark at all), but surely after at least 14 months, and how knows how long it sat on the dealer lot, it should be changed out, right?
If the history of the previous oil service is unknown, certainly change it now to establish the service record including the quality of the oil and filter used. After that, service on the manufacturer's calendar & run-time limits. We will always change before the run-time limit, but disregard the calendar limit. I don't lose sleep over keeping slightly used oil in the crankcase over time. I always exercise the unit on a regular basis to, among other things, drive moisture from the oil. If you do 'worry' about such things, then certainly change your oil regardless of its use at the calendar limit.
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Old 02-21-2019, 09:08 PM   #9
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According to the Onan manual, “change oil at least once a year.”
What he said ^ ^ ^
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Old 02-24-2019, 12:25 AM   #10
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What he said ^ ^ ^
X 2

Just go ahead and change it.
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