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 > onan marquis 7000 generator /no start

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RLS7201

Beautyful Downtown Gladstone, MO

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Posted: 05/10/22 03:13pm Link  |  Quote  |  Print  |  Notify Moderator

Gary45 wrote:

RLS7201 wrote:

Air cooled engines run hotter than water cooled engines. Thus the manufacture does not recommend multi viscosity oils. BUT! that ruling was for non-synthetic oil. Standard oils loose their multi viscosity capacity when run to hot and thin out. So when running multi viscosity oils in air cooled engines, always use synthetic oil. I have the same generator as you and have used 10W-30 synthetic for 22 years with no problems.

Richard

Regular multi viscosity oil is fine in an air cooled motor, air cooled motors do not have a thermostat to make them run as hot as water cooled motors. There are no air cooled car or motorcycle engines anymore because they cannot get them to run hot enough for modern fuel injection pollution control systems.


Onan strongly resists multi viscosity oils in the 7K NHM air cooled generator.
Obviously you have no understanding of the additives that make 10 weight oil multi viscosity. Those additives break down in small air cooled engines and leave you with 10 weight oil.
The reason for water cooled motorcycle engines, is because the higher compression engines don't cool well enough with air. You have it backwards.

Richard

Richard


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Gary45

Oshawa, Ontario, Canada

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Posted: 05/11/22 04:14pm Link  |  Quote  |  Print  |  Notify Moderator

Richard, when I used to have air-cooled motorcycles I could come to stop on the highway and put my hand on the fins, the only time they ever got very hot was idling in traffic, no cooling fan

The water cooled bikes now get extremely hot all the time.

Gary45

Oshawa, Ontario, Canada

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Posted: 05/11/22 04:31pm Link  |  Quote  |  Print  |  Notify Moderator

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwix2-f-vtj3AhUjAp0JHedMBGwQFnoECDQQAw&url=https%3A%2F%2Fwww.thorforums.com%2Fforums%2Ff8%2Fwhy-cummins-onan-does-not-recommend-synthetic-oil-23430.html&usg=AOvVaw2CtbD3ncBwae5MIazeZiCG

Link to Cummins Onan re oil

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