Contaminants and moisture accumulates in the oil in the crankcase (not in the jug), leading to time-based recommendations for a change. Chances are the oil is still good at 12 months or more, but it takes an oil analysis to prove it. An analysis isn't real expensive (about $25), but for many of us it's just as easy and cost effective to go ahead and change the oil.
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1959 Corvette Convertible
Cannondale Slice 5 Bike
2006 Prevost Vantare’ Double Slide
Steve & Annie
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