Hello.
Im the Canadian guy who thought he had a 92 but its the same as your american 89 model.

So have a 89 350 fourtrax. Previous owner said that water was getting into the rear differential and freezing in the winter. Seems to work fine in the summer. But before I drive it any furthur I want to Change the Oil and maybe change the Gasket. So im going to put SAE 80 oil in it.

The Parts guy at the dealer said that the front end needs to have a friction modifier put in with the oil or else it will wreck my positrack front end.

But my manual doesnt say anything about a friction modifier.

So which one is it?

Hello.
Im the Canadian guy who thought he had a 92 but its the same as your american 89 model.

So have a 89 350 fourtrax. Previous owner said that water was getting into the rear differential and freezing in the winter. Seems to work fine in the summer. But before I drive it any furthur I want to Change the Oil and maybe change the Gasket. So im going to put SAE 80 oil in it.

The Parts guy at the dealer said that the front end needs to have a friction modifier put in with the oil or else it will wreck my positrack front end.

But my manual doesnt say anything about a friction modifier.

So which one is it?