quote:If that's the case, then this would be no better than 5w20 oil, in fact much worse! It would be too thin when hot and too thick when cold compared to a viscosity like 10w30.
Originally posted by Ken: It meets the 20W cold cranking spec, and it meets the SAE 20 spec when hot.
quote:I remember 20w20 quite well. My dad swore by Havoline 30wt, but I remember him telling me one time that if he lived "up North" he'd use 20w20 in the winter. For what it's worth, I believe the only difference between an oil labeled 20w20 and 20 was the 20w20 actually had a pour point depressant blended in, where the straight 20 didn't. This didn't affect the cold or hot viscosity, but it would make the 20w20 have a lower pour point.
Originally posted by Ray H: When I was in college, I recall that G.M. specified 20W-20 for my 64 Chevy Biscayne and my dad's 61 Buick LeSabre for mild climates. I still don't understand how 20W-20 is any different than straight 20 weight. "Both" behave like a cold 20 weight when cold, and both behave like a hot 20 weight when hot. (Duhh...) Makes about as much sense as the Circus-Circus Casino in Las Vegas. So, what am I missing here?
quote:Did you say "CAN" haha man my dad used to have actual castrol GTX cans I remember oil coming in cans and Im not that old, but now I really feel old, **** wow thanks I remember 20W-20 as well but was too young to know anything about it
Originally posted by cak446: If you think 20W-20 oil is weird, I have a can of Valvoline All-Climate Heavy Duty SAE 10W-20W-40 motor oil! It is rated SF, SE, CC, and it claims to "Save Gas"! Carl
quote:I remember those big tins as holding 5 quarts. Sure do remember the oil in those glass bottles, and refilling them from the hand-crank pump over that square oil tank. Didn't cars get 1000 mile oil changes in those days, 10,000 mile tuneups and lucky to get 10,000 on a set of tires? 10-30 was something new? 12 volt electrical systems were something new. Of course, I was just a kid then. Ken
Originally posted by williar: Yeah, I remember oil being sold in 1-quart glass bottles with a metal spout at filling stations. The oil was bulk, and the jars were the property of the station. Take-away oil was sold in 1 qt. or 4 qt. metal cans. Later, paper replaced metal for the can's sides - you had to be careful when opening these with an oil spout not to crush the can. Cars used alot more oil back then.