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Old 08-26-2019, 09:13 PM   #1
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Default Onan generator oil

I have an Onan QG 2800 gas generator on my 2019 Coachman CrossFit. I need to do an oil change and cannot find what oil it uses in the paperwork. Any recommendations?
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Old 08-27-2019, 01:35 AM   #2
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5.5.2 Engine Oil Recommendations • Use API (American, Petroleum Institute) performance.Class-Sf SJi or SG engine oil, which may be in combination with performance Class CH-4, CG-4 or CF-4 (for example: SJ/CH4).
• Look for the SAE (Society of Automotive Engineers) viscosity grade. Choose the viscosity grade appropriate for the ambient temperatures expected until the next scheduled oil change.
" Single-grade' SAE 30 oil is preferable when temperatures are consistently above freezing. Multigrade oils are better when wide temperature variations are expected.
TABLE 10. Oil VISCOSITY VS. TEMPERATURE
EXPECTED AMBIENT Temperature's
0C (32*F) and higher= 30W OnaMax
-12 to 38 C (10 to 100*F) 15W-40W (OnaMax
-18* to 27 C (0 to 80*F) 1OW-30 10W-40W
-28 to 10 C (-20 to 50*F, 5W-30W

MLogan
2017 Trend
2800 KW Generator
Smyrna, TN
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Old 08-27-2019, 01:37 AM   #3
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Quote:
Originally Posted by mloganusda View Post
5.5.2 Engine Oil Recommendations Use API (American, Petroleum Institute) performance.Class-Sf SJi or SG engine oil, which may be in combination with performance Class CH-4, CG-4 or CF-4 (for example: SJ/CH4).
Look for the SAE (Society of Automotive Engineers) viscosity grade. Choose the viscosity grade appropriate for the ambient temperatures expected until the next scheduled oil change.
" Single-grade' SAE 30 oil is preferable when temperatures are consistently above freezing. Multigrade oils are better when wide temperature variations are expected.
TABLE 10. Oil VISCOSITY VS. TEMPERATURE
EXPECTED AMBIENT Temperature's
0C (32*F) and higher= 30W OnaMax
-12 to 38 C (10 to 100*F) 15W-40W (OnaMax
-18* to 27 C (0 to 80*F) 1OW-30 10W-40W
-28 to 10 C (-20 to 50*F, 5W-30W

MLogan
2017 Trend
2800 KW Generator
Smyrna, TN
Thank you!!! Exactly what I was looking for.
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Old 08-27-2019, 01:41 AM   #4
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Here is a PDF file on generator maintenance.

MLogan
2017 Trend
Smyrna, TN
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File Type: pdf Generator Maintenance.pdf (1.87 MB, 59 views)
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Old 08-27-2019, 01:54 AM   #5
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Originally Posted by mloganusda View Post
Here is a PDF file on generator maintenance.

MLogan
2017 Trend
Smyrna, TN
Appreciate it. For some reason this was missing in my owners bag that came with my unit. All it had was in onan generator DVD.
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Old 09-04-2019, 02:07 PM   #6
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they sell it at Camping world. 15 W 40 Onan brand. also purchase the screw on the bottle oil filler hand pump. It makes it so much easier.
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Old 10-11-2019, 08:36 PM   #7
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Call Cummins. They are the registered manufacturer of these generators.
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