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Re: Oil viscosity - more difference than I would have thought
Good points about the article, HC. I didn't read it critically, and missed them. My car interest waned in the 90s, though, so I'm probably in the same mindset as the author.
On a related note, Toyota put out a TSB saying its official recommendation for oil lowered viscosity from 0W-30W for my car to 0W-20W. It specifically did NOT recommend 0W-20W for most of its pre-2006 engines, or any of its pre-2005 engines, IIRC, and warned of possible engine damage with the combination of thinner viscosity oil in older engines. I suspect that's because of closer bearing tolerances in 6006 and newer engines. Those of you putting 0W-20W in older cars (of any make) are taking an unnecessary risk, based on my understanding of Toyota's TSB
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bobc455 
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