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Mod | | | Forums66 Topics128,162 Posts1,056,949 Members48,458 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2008 Posts: 125 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2008 Posts: 125 | Apparently, oil that is rated @ 5w30 (multi-vis) is in fact 5w oil, that contains an additive which makes it act as if it's 30w when it reaches operating temps. It does'nt "get thicker" as it heats up, it "Acts" thicker when it reaches operating temps. I remember when I went to Harley tech school, There was a seminar by a Valvoline rep, where he explained this in detail. If multi-vis oil got thinner when it got hot, there would be no reason to label it " multi-vis." Straight wheight oils start out at the rated viscosity, and drop from there as the temps climb. Multi-vis oils start @ the lowest rating, and rise to the higher rating when they reach operating temps. Check this page out. http://www.blackstone-labs.com/oil_viscosity.html
Who is John Galt?
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