Being a newbee at compressors, if the run time is getting longer and longer does that mean the rings are wearing out? The owner manual says nothing about routine oil changes........It only recommends using 40 weight summer and 10 weight winter...non-detergent....which I never do since it is used mostly in mild spring-summer-fall weather
My Coleman belt drive 4.5 HP 26 gallon is almost 30 years old. It is used mostly for cleaning other equipment. It does seem to take longer to "fill" than years gone by.
I'm not opposed to changing to an appropriate oil however.
Cheers,
Mike