Just bought my first trials bike - a 2011 Sherco 250. As you do with a new purchase, I've leafed through the paperwork and come across some contradictions. So the bike was serviced at John Lee's last November and they put 75W in the gearbox. At the back of the manual, in the spec. section, it recommends 10W-40.  In the text of the manual where they explain the location of the drain plug, they recommend 10W-50...  Maybe it's a bit like crop rotation - a different one each t