Changed the gearbox oil recently with some Castrol Syntrans 75W90 GL4 in my 5sp l700. Now gearchanges are rather stiff and 1st to 2nd is really clicky/notchy and will make a small grind when changing too quick. This wasn’t here before and was always buttery smooth with changing gears. Shifting when standing still is a tiny bit better, when it’s warm it gets a bit better, but doesn’t go away completely.
I don’t know what to do anymore, considering I put the same oil in as last change. All the gear linkage bushings are replaced, so I can’t blame the gearlinkage.
Do you think the oil is too thick/thin, or should I go with one that doesn’t have friction modifiers. What do you use gentlemen?