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Old 07-04-2019, 02:41 PM
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CJ428CJ CJ428CJ is offline
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Join Date: Dec 2000
Location: Livermore, CA
Cobra Make, Engine: ERA #629, BBM Side Oiler Block, 482ci, Richmond 5 speed
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Maybe both sides are actually on the same page, stated in vastly different ways, on that point anyway!
Maybe but I don't think so. He makes his point clear when he says, "The "5W" part is thin, so it flows easily when it's cold. The "40" part is a bit thicker, so it supports the bearings, rollers, and such when the engine is hot. It's not logical for it to be the other way around. You wouldn't want something that's molasses when cold, and baby oil when hot." Oil is, in fact, molasses like (well, maybe honey like is a better description) when it's cold and baby oil when it's hot. Granted, 5w-40 will be less molasses like than straight 40 would be when cold (and similarly, 5W-40 will be less baby oil like than straight 5 when hot) but every engine oil whether multi-grade or single weight is going to be thicker when cold than it will be when hot.
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