I think the best engine oil, gearbox oil, brake fluid... are Motul. Many peoples know that but because of the price of Motul will be bit higher when compare with all other brands, like shell, mobil, castrol, Q8, Toyota, etc....... so at the end they cant afford to buy it. If you wish to buy 'high quality' oil, i recommand you consider Motul. Just let you know something, Malaysia A1 team using the Motul Brake Fluid (engine oil cant use because of controlled by the engine supplier), some of the malaysia racing teams there use their own products but inside the bottle is Motul oil, dont ask me who is it, i wont tell you :) In Motorcycle, if you ask them is Motul products good for motorcycle, see what they will tell you. Motul will protect your engine, very clean and smooth for you engine and gearbox. If you dont believe it, if you have the chance to compare two engines, one is use Motul, another one is use other brand, then you will get the answer ( very simple, just open the valve cover then you will see the different).
Please please dont misunderstang i am not try to sell the Motul here, i just wish to share with the peoples who are wish to look for and use the good engine, gearbox lubricant.... products.