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Old 10-28-2018, 01:08 PM   #1
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Onan generator -- Oil Filter ??

Time for the first oil change (20hrs). Looking at the manual I can't find any indication that there is an oil filter for the Onan 4.0kw generator. Manual says to change the oil but no mention of a filter.... ??? Hmmm

Am I missing something??

Help and suggestions appreciated.
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Old 10-28-2018, 01:10 PM   #2
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The Onan 4k does not have an oil filter. Very simple process. Drain oil using drain plug on bottom of unit. Replace drain plug and refill with 1.6 quarts of oil. Done.
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Old 10-28-2018, 01:18 PM   #3
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WOW, now that's fast reply. THANK YOU.
I do figure you had minor typo as manual says 1.6 qt of oil (not 2.6) but again thanks.
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Old 10-28-2018, 01:19 PM   #4
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Lol you are correct 1.6 quarts. My fingers are faster than my brain.
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Old 10-28-2018, 01:37 PM   #5
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re

Use 30w, not synthetic
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Old 10-28-2018, 02:03 PM   #6
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due to temp spread here in Oregon was going to use 15w-40 (per manual).
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Old 10-28-2018, 03:11 PM   #7
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Use 30w, not synthetic
Why is that? Not prohibited per the manual.
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Old 10-29-2018, 02:38 PM   #8
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Time for the first oil change (20hrs). Looking at the manual I can't find any indication that there is an oil filter for the Onan 4.0kw generator. Manual says to change the oil but no mention of a filter.... ??? Hmmm

Am I missing something??

Help and suggestions appreciated.
20Hrs, not sure about that one. I changed mine at 150 and the oil looked fine. 15/40w is what I used and haven't had any issues.
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Old 10-29-2018, 02:50 PM   #9
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20Hrs, not sure about that one. I changed mine at 150 and the oil looked fine. 15/40w is what I used and haven't had any issues.
Oman manual page 29 calls for initial oil change at 20 hours the every 150 hours after that.
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Old 10-29-2018, 03:01 PM   #10
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Oman manual page 29 calls for initial oil change at 20 hours the every 150 hours after that.
I hope that the dealer did it, but most likely not. It runs great and I run Marvels Mystery Oil in the gas and put about 3 Oz's in the oil at the change.
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