Your site is very interesting and full of good informations and stuff. But I'm suprised about the price of the castrol 10-60 for bmw Mpower oil 13.8£ per liter...?
My local dealer sell it 9.24£ per liter and when you buy a box of 12 liter it's 8.40£ per liter
same discount on transmission and rear axe oils like the 75w140SAF XJ
