Hypoid oil

[Dogma]

Draketh mentioned changing oil, and that reminded me. I've been trying to find a source for 90W hypoid oil. All the auto part stores around me carry 80W-90 Hypoid oil, but not straight 90W. Should I not sweat it and go with the multi-viscosity, or keep looking? If I should keep looking, where should I be looking?

BTW, what's different about oil for hypoid gears? Some additive that helps with the sliding action?

[lurch12_2000]

I used 80W-90 because I didn't find straight 90W either.

[rustybronco]

Don't sweat it... I use 75w90.

[Dogma]

Thanks guys. How many miles do you have on that stuff?

I suppose the 90W part of the blend takes over at operating temps, but I usually like to stick to the recommendation cast into the thing itself, so I'm still nervous. I need to attract the attention of one of our local lube gurus: I USE FRICTION MODIFIERS! That oughtta do it.

[rustybronco]

About 10,000 miles so far on 75w90 synthetic axle lube.

friction modifiers in a non clutch type axle, why for?

rear axle lube has extreme pressure additives in it.
you can use 75w90, 80w90, 75w140....

[lurch12_2000]

Thanks guys. How many miles do you have on that stuff?

I suppose the 90W part of the blend takes over at operating temps, but I usually like to stick to the recommendation cast into the thing itself, so I'm still nervous. I need to attract the attention of one of our local lube gurus: I USE FRICTION MODIFIERS! That oughtta do it.

I've put over 2k miles since I changed the tranny and rear end oil, and ridden in various conditions, including cold (30) and hot (95) outside temps and hours of commuter stop and go traffic.

[MichaelHoward]

I used 80-90 from auto parts place in my 1100G for years, no problems at all.

[Grandpa]

Thanks guys. How many miles do you have on that stuff?

I suppose the 90W part of the blend takes over at operating temps, but I usually like to stick to the recommendation cast into the thing itself, so I'm still nervous.

Oh, for heaven's sake, stop the nervous crap. Just use 80W90 or 75W90, relax, and enjoy the motorcycle.

I've been using 80W90 for 22 years and 400,000 miles on GS shafties. My GK has 130,000 miles.

I change the gear lube in both the middle gear and the rear end once a year. I ride between 10,000 to 13,000 miles per year.

Just use it and be happy. :-)

[Dogma]

About 10,000 miles so far on 75w90 synthetic axle lube.

friction modifiers in a non clutch type axle, why for?

rear axle lube has extreme pressure additives in it.
you can use 75w90, 80w90, 75w140....

"I use friction modifiers" was jokingly intended to draw the attention of the lube gurus to the thread. I don't actually use them.

[Dogma]

Oh, for heaven's sake, stop the nervous crap. Just use 80W90 or 75W90, relax, and enjoy the motorcycle.

I've been using 80W90 for 22 years and 400,000 miles on GS shafties. My GK has 130,000 miles.

I change the gear lube in both the middle gear and the rear end once a year. I ride between 10,000 to 13,000 miles per year.

Just use it and be happy. :-)

Ah, now there's some conclusive test results for sure! Thanks!

[rustybronco]

"I use friction modifiers" was jokingly intended to draw the attention of the lube gurus to the thread. I don't actually use them.

I knew you were, that's why I referenced it to the rear axle...
just trying to fire you up!

[Zook]

All I've ever used was 75-90, 80-90 90-140, or lately, red Line Shock Proof heavy, which is a TRUE synthetic (not an ultra refined dino oil) which has the lubricating properties of a 90-250 without the drag of a 250 wt.
I can tell ya this-I put it in the transmission of my 90 Guzzi (dry clutch auto type tranny) and it really slicked up the shifting.
If you know anything about how Guzzis shift, you'll understand.
A friend uses it in his race cars which put out in excess of 800 hp and he uses it all year with excellent results. If it works there, it should really work well in our bikes.

[Dogma]

I knew you were, that's why I referenced it to the rear axle...
just trying to fire you up!

No wonder I couldn't make any sense out of it!

[rustybronco]

a clutch pack "traction lock"- "limited slip" rear axle requires a friction modifier additive also.
now do you?

[Dogma]

a clutch pack "traction lock"- "limited slip" rear axle requires a friction modifier additive also.
now do you?

Yeah... Didn't know about that. Even funnier, since people keep calling the bike's final drive a "differential".