great
also one more question regarding such oils
I went to buy an oil for mehran, most of the oils were SL, SM, or SN
so i went for a 15w-40, Mobil1 Delvac Super 1300 which is API SJ
one of the guys there started arguing with me that using such oils in petrol engines generates some 'ash' which clogs oil galleries and whatnot..what was he upto? i just replied that diesel engines have oil galleries too 