I believe I have the same unit but it has no hour meter it also has no filter. Most of the small engine stuff I own gets a work out including my zero turn that has a filter it's a 50 hour change. They get changed in the spring oil is cheap a 25 HP twin cylinder engine is not. I have a log splitter that takes a real beating it also gets changed once a year it never ceases to amaze me that it just runs and runs wide open for hours on end. Little gas engines being carburated are not really fuel efficent and end up with a lot of fuel in the oil they are not like a modern car engine.That being said I do run the generator once a month for a while with a light load but really see no need to change the oil every year it gets warm enough to get rid of any moisture that may accumulate. I have hear people say it makes an engine feel better well I don't believe an engine feels any thing but the owner does.
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