That is the main thing, go get some cheap oil and fill it up, run it, drain it and repeat until no milky color. About 6 to 10 times, then change the filter and check your diffs and stuff if you wish. If it has a hard time running you might need to drain the carb, if you got it real bad you might have some water in the gas. Hope you get it running back to normal, you shouldn't have too much of a problem.