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Originally Posted by CJ_Boxster
I have a question, and its pretty stupid... Is 40 Weight the same as 0-w40?
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Hi,
No, it's not the same. Multi-weight, or Multi-viscosity Oils contain long-chain molecules called polymers. At cold temperatures, the polymers are coiled up which allow the oil to flow as an Oil with the 1st number (W) weight.
But, when the oil warms up, the polymers unwind into long chains that prevent the oil from thinning as much as it would otherwise. The result is that at 100° C, the oil will thin as much as the higher viscosity number indicates. Another way of looking at multi-viscosity oil is to think of a 0W-40 as a 0 weight oil that will not thin more than a 40 weight would when hot. Hope this Helps...
Happy Motoring!... Jim'99