Just an update for all Manual CL9 owners. The gearbox in the CL9 like the thinner 75w80 oil, and most brands such as Amsoil and Redline as well as OEM is 75W80. If you want smooth gear changes, it's best to stick with this. Recently, I had my gearbox oil changed by OTR Clayton, who use only Motul oil. Now while Motul oil is great, unfortunately they make only 75W90 oil, which is way too thick. The result is the syncros, especially in first and second where there are multiple syncros, don't work as well, resulting in the gearbox not wanting to move out of 1st, or go into 1st or 2nd on a fair few occasions (due to ratios not matching at the point of time). Of course, the argument (by OTR and Motul) would be that the thicker oil provides more 'protection' to the gears and syncros, especially when thrashed or tracked, but for for daily driving, it's more of an annoyance than anything.