Quote:
Originally Posted by 78F350
0 weight Mobil1 oil? I put in in one of mine because it was on sale. Next 6 month change I think it's going to 10W-40 Castrol Edge, if the engine hasn't had a catastrophic failure by then. :dance:
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A very common misconception is that the "W" stands for weight. That's not true. It stands for "Winter" and just means that the first number is the viscosity rating at 0 celsius. The second number is the viscosity rating at 100 degrees celsius (212 fahrenheit) which is generally operating temperature. So it's the second number that you're really concerned about. The biggest advantage of a low Winter number is quicker flow at startup.
A great read for oil basics is Bobistheoilguy.com's Motor Oil University blog.
Motor Oil 101 - Bob is the Oil Guy - Bob is the Oil Guy
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