Posted by dej(Jed) on June 08, 2012 at 05:48:43 from (141.189.251.1):
In Reply to: 30w or 20w question posted by BigTone on June 01, 2012 at 17:57:51:
Multi visc oils won't take the high temps that a straight weight will. To each his own though. A 30w has the same initial vicosity as a 15w40 oil. What do you gain with a 15w40 over a 30w? Oil companies really have sold us all a bill of goods with their marketing. When they couldn't sell light oils they sold us on the idea of multi visc oils. Harley Davison uses a 20w50. Imagine that a Harley engine has no trouble picking up a 20w oil at start up. A 20w is about the equivalent of a 40w. Piston aircraft engines use anywhere from a 30 w to a 60w, all straight weights. Go figure...LOL.
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