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i may be wrong but last i checked the 1st number has to do with the actuall viscosity (thickness) of the oil. The second number is the oils "drip factor" for lack of me knowing the correct term. All the second number has to do with is how fast the oil will drip at a certain temperatures. If you are in a cold climate i would say don't go lower than 5w30. if you live in a hotter climate i see no problem running 5w20 or even 5w15.
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