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The labels on the transmission oils available to me say that they are either GL-4/GL-5 or just GL-5 spec. The Red Line site (https://www.racerpartswholesale.com/redtech4.htm)
says that GL-5 spec is bad for the life of brass syncro rings on most transmissions and points to their MTL or MT90 oil. I can't find Red Line in my local stores--does Red Line's claim seem to make sense or are they simply creating a niche for their product? This is for a Toyota 5-speed box.
says that GL-5 spec is bad for the life of brass syncro rings on most transmissions and points to their MTL or MT90 oil. I can't find Red Line in my local stores--does Red Line's claim seem to make sense or are they simply creating a niche for their product? This is for a Toyota 5-speed box.