what year? also throwin a bit of diesel (1-2 tablespoons) in the cylinders could help, then after you get it running, drain the oil, throw 5 quarts of diesel in, run for 10 minutes, then drain and fill with 20w50 conventional oil. the diesel will help clean out the bad stuff.
I know a lot about cars. I can look at a car's headlights and tell you exactly which way it's coming