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rotorwrench · 09-30-2014, 06:27 PM

The Lubricant that was recommended back in the day was GL-3 SAE 80 or 90 in hot weather. GL-3 lubes are way long ago superseded by GL-4. Sta-Lube has SAE 85/W90 that fits the bill. NAPA carries this product. It's also available in SAE 140 but that's a bit thick for an overdrive.

SAE 50 motor oil is the same viscosity as SAE 90 gear lube since there are not graded the same way but it has very little pressure additives but more than the GL-1 lubricants. I'd use GL-4 rather than GL-1 given the choice but GL-1 will work under mild use. Another choice is SAE 40 or SAE 50 motor oil. It is as close as you can get to the original lubricants used for the B&W ODs.

09-30-2014, 06:27 PM	#33
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,422	Re: R10 Overdrive Issue The Lubricant that was recommended back in the day was GL-3 SAE 80 or 90 in hot weather. GL-3 lubes are way long ago superseded by GL-4. Sta-Lube has SAE 85/W90 that fits the bill. NAPA carries this product. It's also available in SAE 140 but that's a bit thick for an overdrive. SAE 50 motor oil is the same viscosity as SAE 90 gear lube since there are not graded the same way but it has very little pressure additives but more than the GL-1 lubricants. I'd use GL-4 rather than GL-1 given the choice but GL-1 will work under mild use. Another choice is SAE 40 or SAE 50 motor oil. It is as close as you can get to the original lubricants used for the B&W ODs. Last edited by rotorwrench; 10-09-2014 at 01:35 PM.