I would like to switch over to Redline transmission oil but am somewhat confused over what grade to lose. The manual only says "Automatic Transmission fluid for Manual transmissions" Can I use MTL type which is supposed to be 70W80 GL-4 gear oil (SAE 5W30/10W30 engine oil viscosity) or should I go with synthetic ATF or D4 ATF. I know that an E36 M3 manual transmission went with D4 ATF, but I'm not sure if that is the correct one for the Getrag 5-speed in my car. Please advise.

Link to Redline Oils

Thanks for the help,
Giancarlo

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PAST MB's: 2006 E55 AMG | 1986 190E 2.3-16