How much oil?
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How much oil?
I guess you don't have an owners manual, but you can get the information, and maybe a manual, from your local dealer. The 425 is basically just a 500 that isn't bored out all the way. I'm guessing the fluid capacity is the same. Probably 2 quarts of oil, 1 quart of transmission fluid, and 2.25 quarts of radiator fluid.