Or it(the dirt) never gets past the rings / valve guides and into the crankcase, so synthetic oil stays cleaner because of the superior ring seal.
I use Mobil 1 synthetic in both of my rider mowers with Briggs OHV engines. The synthetic can stand the extra heat of a hard working air cooled engine, plus the better ring seal keeps it cleaner much longer. Oil consumption is near 0 at 50-75 hours.
My Toyota Prius specifies 10,000 miles between oil changes of full synthetic 0W-20. At 10,000 miles, it has only darkened slightly from baby oil clear to a light syrup brown, just enough to make it a bit easier to see the oil line on the dip stick.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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