in the 60 , 70 , 80 , 90 s on MB , 30 or 20/ 50 where it . 10 / 40 on us cars . So now what is the point if the viscosity written on the can means nothing . the manual , and castrol mention 0w30 or 0w40 .so you would think the popular high quality 5w30 synt wo... Login to read more.