i change my compressor oil every month when i'm using it daily otherwise i change it every 3 months, and my pressure washer does not see much use si i only change that at the begining and end of the season yeah i'm anal about maintaining my stuff if it gets dirty i wash it if the fliuds and filters look dirty i change them reguardless of how much use it has seen
My portable 3kw generator has only been used 4+ hours in the past four years, and I have just changed the oil once, mostly to see how to do it.
The mower gets an oil change every year.
The stationary vertical 2-stage compressor in the garage also gets a change once a year. I plumbed up a drain tube and ball valve so it drains into a pan on the floor. When first installed, I still had kids at home, and was smart enough to remove the valve's lever and hide it.
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