28-09-2019, 09:48 PM
When I got my RP saloon (4 speed all crash gearbox) the gearbox had what looked to be SAE 80 or 90 in it. Changing the oil to 20W/50( the high zinc mineral sort that I use in both my Polo Mk2 and the Landrover Series 3 engines) made the gearbox much nicer to use. The factory recommended using engine oil in the gearbox and I tend to trust that the factory knew what it was doing.