Looking through the owner's manual for my '78 Mercedes 300D, with a 4-speed manual trans. the recommended oil is a 10 or 20W engine oil. Later manuals (early 80's) call for ATF.
Having already drained the fluid of the Dex/Merc ATF I put in when I got the car, I found some Supertech SAE30 rated CF/SG and filled with that. Shifts are a bit "thicker" but not prohibitively so and no bad behaviors showed up.
What's the scoop on older boxes that recommend ATF, motor oil, etc.? What type (synthetic, conventional, older API rating or not) is going to satisfy the intended friction characteristics, etc.? Does a product like Redline MTL or Amsoil Synchromesh have any benefits/drawbacks in these applications?
Having already drained the fluid of the Dex/Merc ATF I put in when I got the car, I found some Supertech SAE30 rated CF/SG and filled with that. Shifts are a bit "thicker" but not prohibitively so and no bad behaviors showed up.
What's the scoop on older boxes that recommend ATF, motor oil, etc.? What type (synthetic, conventional, older API rating or not) is going to satisfy the intended friction characteristics, etc.? Does a product like Redline MTL or Amsoil Synchromesh have any benefits/drawbacks in these applications?