I bought three bottles for my Quantum gear box - Saab Vintage Models Bulletin Board - Saabnet.com
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Per Tom Donney, the current crop of gear oils are too viscous for these old boxes, and to stay with 80 weight oils, or lighter in winter. I assume his opinion is based upon seeing too many vintage gear boxes needing repairs.
I don't know if the oil you referenced is a GL-4 or GL-5. I bought the GL-4 Ravenol 75-80W because of an article in a Vintage Car magazine which stated the super-dooper Extreme Pressure additives used in the GL-5 oils are actually corrosive to the non-ferrous components of older gear boxes, therefore older transmissions should use the GL-4 lubes. Tom told me the new non-ferrous parts he installs are compatible with GL-5 oils.
All of this may be subjective, but it is the points I used when making my decision. Three liters is enough for an initial break-in fill after its current rebuild, and a subsequent Drain & Fill.
->Posting last edited on Wed, 17 Feb 2021 06:35:12.
2008 9-5 Aero Sedan, sold at 227K miles
2006 9-3SC 2.0T - Wife's daily driver
2000 Viggen Convertible - Summer Fun Car
1964 Quantum IV Formula Car - Retirement project
2000 9-5lpt Sedan, sold at 318K miles
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