What speaks for and what speaks against an oil change with a 20-year-old manual transmission? The transmission is tight and switches completely normal – except if it’s too hot outside, then the reverse movement is sometimes haggle. I can imagine that 20-year-old oil does not necessarily have the best characteristics anymore. On the other hand, an experienced car master told me that with such an old transmission no oil change is made anymore, because this removes the whole abrasion and it in What do the gear specialists mean among you?