For later M41s with J-type, the original recommendation was also for 30W, but this was changed to 80/90W sometime in the early '70s although we know of no changes to the specifications of the OD. Factory manuals recommend 30W oil for the M41 with the earlier D-type OD (through the '69 model year). I'm not sure I buy this version of better living through chemistry, but certainly clean lubricant of the correct viscosity is critical to proper function.Įditor's note: Experts disagree on which fluids to use with Laycock OD. I know many people are pleased with the use of high quality synthetics, such as Redline MTL, claiming it has improved their overdrive operation. The oil used must provide both lubrication and shear qualities that allow the internal friction clutches to operate effectively. The use of anti-friction additives is specifically prohibited according to the Laycock manual. In either case, synthetic lubricants are recommended, particularly in hot climates and for heavy use. The M41 approved fluid is 80/90 weight gear oil. In the case of the M46, type F (or G, no longer available) ATF is specified. The first thing to check in this department is for the proper amount of the correct lubricant.
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