Final Drive Oil Question


Information and questions on GL1200 Goldwings (1984-1987)
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BikerNewsman
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Motorcycle: 1985 GL1200 Limited - Anniversary Edition

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1974 Yamaha 650

Final Drive Oil Question

Postby BikerNewsman » Sun Jun 03, 2012 10:40 am



I want to replace the old final drive oil with fresh. The owner's manual says to use a straight SAE 80 HYPOID gear oil. All I can find within a 20 mile radius that seems anywhere near compatible is "standard", full-synthetic, and synthetic-blend gear oil in 80w90. One place has an 80w90 "Hypoy" gear oil, but has the notation on the bottle that it is for Limited Slip differentials.

My question is... what is a safe substitute for what the owner's manual calls for, and/or does anyone know of a source for exactly what the manual says to use?

The bike is a 1985 GL1200 LTD with CFI.


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SilverDave
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Re: Final Drive Oil Question

Postby SilverDave » Sun Jun 03, 2012 12:15 pm

I talked to a mechanic friend about 4 years ago, because I could not find "80" either.

HIS considered opinion was that 80 or 90 made little difference...... Gear oil is gear oil .

. The important thing was to change it often ( annually ) , to remove the water, and accumulated metal bits , and not to overfill it...

Castrol makes a nice 90 Gear oil, with a convenient cap/spout on the top, which is available from many marine shops .

Castrol SAE90 Outboard Gear Oil:
http://www.bing.com/images/search?q=Cas ... ORM=IDFRIR


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Mooseman
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Re: Final Drive Oil Question

Postby Mooseman » Sun Jun 03, 2012 1:38 pm

The numbers "80W-90" refer to the viscosity grades of the oil. Since it has two numbers, this oil has two viscosity grades. The 'W' means winter. The number "80" -- in this case -- signifies that the oil is designed to work well in lower temperatures. The second number defines how thin the oil must be at 100 degrees Celsius. The lower the number, the thinner the oil must be.
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BikerNewsman
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Re: Final Drive Oil Question

Postby BikerNewsman » Sun Jun 03, 2012 9:59 pm

Thank you both for your replies. My concern is that non of the gear oils I found mentioned "hypoid" which is a different configuration, and stress factor, than other gears so.... if non of the gear oils I've been able to locate say they are for Hypoid gears are they still "safe" for use in this application?
"It ain't about the miles, it's all about the smiles".
My (non-commercial) motorcycle blog = http://dixieriders.wordpress.com/purpose/

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Mooseman
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1986 GL1200A (SOLD) 81K
1985 GL1200A (SOLD) 85K
1986 BMW K75c 25K

Re: Final Drive Oil Question

Postby Mooseman » Sun Jun 03, 2012 11:25 pm

Hope this helps.

http://en.wikipedia.org/wiki/Gear_oil

Most lubricants for manual gearboxes and differentials are hypoid gear oils. These contain extreme pressure (EP) additives and antiwear additives to cope with the sliding action of hypoid bevel gears.
Enjoy the ride. They are all good, just some better than others.
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Re: Final Drive Oil Question

Postby WingAdmin » Tue Jun 05, 2012 2:01 pm

I used Valvoline SynPower full synthetic 75W-90 on my 1100, which calls for SAE 90 above 41F and SAE 80 below 41F. It is excellent (and specified) for hypoid drives, and would work very well in your GL1200. As mentioned here, more important that it is changed regularly.

My GL1500 also specifies SAE 80 oil, and I use the same Valvoline synthetic 75W-90 in it.

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BikerNewsman
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Re: Final Drive Oil Question - Answered :)

Postby BikerNewsman » Sat Jun 09, 2012 8:44 am

Thank you all for your input. :D I have decided to use the Lucas "M8 Pure Synthetic Marine Gear Oil" (pictured). It exceeds GL5 and is applicable for API SAE Grade 80w90. It also has "anti-foaming" agents.
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"It ain't about the miles, it's all about the smiles".
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