ATF, Dexron 2 or 3 should be ok. Some of the older pumps used to use 10W40 oil aswell. That's abit thicker but it shouldn't leak with either oil in. It normally just changes the speed of your trim with the thicker oil in the system. If you have no external leaks I would check the pump is holding pressure first.
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Class 3C Mono EPA National speed record holder 95.35 mph Avg!
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