I'm going on a ~500 mile round trip soon with my EZ trailer and boat.
I've taken the boat out only 3 times this year , but I noticed the other day, there might be water in the hubs and a possible slow leak. I forgot where the oil level was on it last year. But both sides, the oil levels are exactly the same....
Anyways, manual states 50w oil, or 90w gear oil.
I have some Mobil 1 75w-90 gear oil on hand. I was hoping to use that if I could.
But I would probably be more comfortable getting something closer to the spec recommendation.
I know Amsoil has a 80w-90 gear oil.
They also have a "Marine" 75w-90/80w-90 mixture.
If I remember correctly, my local West Marine has 90w gear oil,but it's some brand I've never heard of.