Hussam,
Are you happy with the quality of Castrol oils in the recent past. My last experience was with their RX Plus Turbomax and it was not a really good one. The oil thinned out in under 3000Km and had to be changed. I also read about an impending case with Castrol India and Chandigarh Trasnport, CTU alleged that Castrol India send them re-cycled oils which detiorated when used and casued premature engine failiures in their buses.