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Tractor Talk Discussion Forum

GL1 Oil

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Ken-in-K

08-23-2005 10:37:20




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There has been a lot of discussion on this forum regarding GL1 Oil.
Is this an:-
1. Engine oil ? such as, 30W
2. Gear oil ? such as, 90W
3. Hydraulic oil ? for 3pt linkage.
How does this vary from any other oil, and what is its main applications. Any special reasons would be helpful.
I rest my case, ( No, not that sort of Case).




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buickanddeere

08-23-2005 13:34:03




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 Re: GL1 Oil in reply to Ken-in-K, 08-23-2005 10:37:20  
GL-1 is a gear lube without additives which can corrode copper based bushings. For improved lubrication GL-4 Marine, not just plain GL-4 works well. It"s high pressure additives do not corrode copper based metals should some water end up in the gear lube.



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Jerry/MT

08-23-2005 11:08:37




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 Re: GL1 Oil in reply to Ken-in-K, 08-23-2005 10:37:20  
It's a gear oil that's also used as a hydraulic fluid in many older tractors that use the transmission/rear axle housings as the hydraulic sump(or reservoir). I would call it a transmission/hydraulic oil in this application. I believe it is generally available in 80W and 90W.



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Jay (ND)

08-23-2005 10:59:38




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 Re: GL1 Oil in reply to Ken-in-K, 08-23-2005 10:37:20  
It's a gear oil.

Stolen from the API website:
API GL-1 denotes lubricants intended for manual transmissions operating under such
mild conditions that straight petroleum or refined petroleum oil may be used
satisfactorily. Oxidation and rust inhibitors, defoamers, and pour depressants may be
added to improve the characteristics of these lubricants. Friction modifiers and extreme
pressure additives shall not be used.
API GL-1 lubricants are generally not satisfactory for many passenger car manual
transmissions. However, these lubricants have been used in some truck and tractor
manual transmissions. Lubricants meeting service designation API MT-1 are an
upgrade in performance over lubricants meeting API GL-1 and are preferred by major
commercial vehicle manual transmission manufacturers. In all cases the transmission
manufacturer’s lubricant quality recommendations should be followed.

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