Not to hijack a thread or anthing. But i been running regular gl-5 75-90 gear oil in my 89 sp pump for a few months now and do far so good ... Does it have to be synthetic or ??? Maybe a dumb question but theres only a bearing and a few seals in there and i dont think theres anymore stress in the pump than in my dually axle that runs regular gear lube...
Seadoo do a small bottle of jet pump synthetic oil. When changing it wear gloves. Its the worst oil Ive tried to get off my hands. It stinks for days. Cant wash it off/ out of your skin.uke: