yeah I got to reading one day what royal purple had in it for racing.Then found out diesel oil had more calcium,and phosphorus, and zinc.Our 1960s oil was good till they changed to cats.I have no cats so,I run a better oil.I change at 5000 miles, if 15w40,and 5w40 10,000 miles with filters changed at 3000 miles

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt