Onan Generator Air Cooled
Small aircraft engine Air cooled
Generator limited RPM
Aircraft limited RPM
Generator sees wide temperature range
Aircraft sees wide temperature range
Generator can see much hotter metal temps
Aircraft can see much hotter metal temps
The big difference is ASH content of the oil
Onan used to make an uproar about ash content with Onan engines using LPG
Question: Is the newer API service J or service K oils as low in ash as aircraft oil? If there was no difference then why does Lycoming insist on low ash engine oil. This area should be explored. There is something to it.
