Quote:
Originally Posted by Got_The_Benz
5W40?? isn't that a bit thin??? I run 15W40 in the summer and 10W40 in the winter..
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The W40 is the viscosity when the engine is up to temperature. No matter what the first number is, it will NEVER be thinner when cold than it is when warm.
Even a 0W40 will be thicker than a straight 30 weight oil at operating temperature.