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What do the numbers mean with motor oil?

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shmokes:

If my car calls for 5W-20 and I put in 10W-30 will my car explode?

crashwg:

http://en.wikipedia.org/wiki/Motor_oil

ChadTower:

No.  It just won't be optimally protected.  The first number is cold viscosity and the second number is hot viscosity.

The W stands for Winter rated, which is why it's attached to the cold rating.

shardian:

10w-30 is pretty much an all-weather oil. If you don't have extreme weather, it will work fine.

ChadTower:


Or a specialized car (big ass SUV or high end sports car).

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