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Old 05-24-2016, 06:17 PM   #1
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Original coolant in Onan generator.

Our diesel 2010 Damon Astoria came with "Alliance" engine coolant. Can I assume our Onan diesel generator came with the same coolant?

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Old 05-24-2016, 07:37 PM   #2
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Originally Posted by bobguigley View Post
Our diesel 2010 Damon Astoria came with "Alliance" engine coolant. Can I assume our Onan diesel generator came with the same coolant?
Not necessarily. My Cummins ISC came with different antifreeze than my Onan 7.5KW quiet diesel.

Dennis and Katherine
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Old 05-24-2016, 07:42 PM   #3
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The main engine and generator are completely separate systems. They very likely have different coolant types. Onan 7.5K Quiet Diesel says the following under 'Changing Coolant': "The engine cooling system is filled with a 50/50 mixture of ethylene glocol anti-freeze and water... Use ethylene or propylene glycol anti-freeze solution that contains a rust and corrosion inhibitor. The anti-freeze should not contain a stop-leak additive."


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 05-24-2016, 07:53 PM   #4
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Nope, don't assume that at all! The generator doesn't need OAT or coolant containing SCA's whereas the engine does.
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