Quote:
Originally Posted by 07bloomfieldb
Why does it need 0-40? What's wrong with 10-40?
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Nothing is wrong with using 10w40. The initial viscosity (measured at 40'c) is just a little thicker with the 10w vs 0w. The second number is most important. A 0w-40 and 10w-40 both have 40 weight operating temperature viscosity. The ow is thinner in ambient temperature, which can pour in lower temperatures. For summer, I recommend 10w40 because it is stronger for thermal breakdown. 10w40 is less volatile then ow40. Will give better protection when hot outside. However, if you are using a true chemically derived synthetic motor oil such as AMSOIL, both will work great. You can even mix the two!
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motor oil
I use Mobil 1 MX4T
