Gear oil for shafty

[Guest]

Sorry if this has been asked before (I bet it has) but I had a search around the site and couldn’t find anything.

Just wanting to give the GS1000G some extra tlc and was thinking to change the gear oil and final drive unit.

spec says SAE 90, but I’ve got some bottles of SAE 75w90 in the garage... is this just the modern equivalent and ok to use of is it different stuff and should I by the correct grade??

[salty_monk]

That's what I used. Hard to find straight 90w. The spec also gives you a GL - GL5 I think from memory.

Dan

[eddypeck]

That’s great, thanks. Just checked primary and secondary drive units and levels are good and what’s there looks fairly new. Previous owner had recommissioned it after a few years sleep so looks like they did that at least.

So I’ll leave it for now but at least I know I can use up my leftovers next time round.

[Steve]

Yep, 75w-90, 80w-90, "regular" or synthetic, it's all good.

.

[bwringer]

FWIW, you can find straight 90W, intended for outboard motors. There's no point, though.

Use whatever 80W-90 or 75W-90 they happen to have at the auto parts store. As long as it's GL-5, brand doesn't matter.

The final drive on a GS is one of the more lightly loaded places gear oil can end up. I change it every year or so and it always comes out looking pretty much the same as when it went in. If you're reasonably careful, you can get two years out of one liter bottle.

[gdayjr]

I use a 75w90 in all my bikes gearbox, and final drives.

[Steve]

The final drive on a GS is one of the more lightly loaded places gear oil can end up. I change it every year or so and it always comes out looking pretty much the same as when it went in. If you're reasonably careful, you can get two years out of one liter bottle.

I get a little more life than that out of a bottle, probably because I don't put on quite the miles that Brian does.

I change the fluid in the secondary drive and final drive (and lube the splines) when I change a tire.

.

[Redman]

.............Just wanting to give the GS1000G some extra tlc ..............

Speaking of extra TLC, and the rear end of the bike,
Steve mentioned lubing (grease) the hub-splines in rear wheel. Learn about that if you don't already know.
Not really extra. Is required, basic.