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rotorwrench · 11-17-2023, 06:16 PM

GL4 for the OD unit. The recommendation in my Lincoln Mercury O/H manual was mild EP. GL3 was mild back then and GL4 replaced that. SAE 85/90 GL4 would be good. Stay-Lube is available. The unit has an overrunning clutch that can be damaged by high EP lubes.

11-17-2023, 06:16 PM	#9
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,483	Re: Borg Warner Overdrive in a ‘31 Model A GL4 for the OD unit. The recommendation in my Lincoln Mercury O/H manual was mild EP. GL3 was mild back then and GL4 replaced that. SAE 85/90 GL4 would be good. Stay-Lube is available. The unit has an overrunning clutch that can be damaged by high EP lubes.