Quote:
Originally Posted by gilbertfg
Let me throw my 2 cents out here! W stands for WINTER, not weight. Oil is measured with viscosity. So for those of you using the wrong thicker oil, think this way if you force a thicker oil through smaller passage you're damaging the seals. Viscosity rating has something to do with WINTER due to oil freezing. Let me double check with my Army books lol....
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Yes, w in 5w-30 stands for winter, as the first number with the w is the viscosity rating when cold and the second number is when hot.
But since most people uses weight when referring different viscosity oil rating, the term weight stuck.