Why does the oil turn black every use?
after running my brushcutter fo an hour it stops and the oil is black
@mopriestley what do your plugs look like? The engine is a honda gx25? Have you checked the valve? Done a compression test or a leak down test? It does sound like you have a lot of soot buildup inside your engine. Mist likely lots on your combustion chamber, oil sump, valvetrain etc. of course you changed your oil filter frequent etc. what‘s of greater concern is that your engine actually stops. Time to go over this engine and possibly consider a partially teardown/rebuilt.
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