08-12-2010, 08:03 AM
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#1
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Registered Member
Join Date: Nov 2007
Posts: 1,853
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Re: Oil viscosity - more difference than I would have thought
The numbers on the label just refer to a standardized range of viscosities. The true synthetic 0w30 Castrol is thick for a 30 weight. The 5w40 is still thicker, but oils thicken with use, and the old 0w30 may have been thicker than the new 5w40.
http://www.bobistheoilguy.com/visc.html
http://www.castrol.com/liveassets/bp...syntec_usa.pdf
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