Hello everyone. I have been using mobil 1 oils for years with good results as far as engine wear and sludge removal. Recently i was talking to a shop and they told me that castrol edge is better then mobil1 i am about to buy oil for my next oil change (did one a week ago for spring). I want to know which oil i should buy and use. I have used 0w40 mobil 1 syntethic inmy engine for 4 years and before that it was regular mobil 1 10w40 and 20w50. Since it is only $0.15 more a quart i though i might as well ask forum members. I was going to get liqui moly but the prices have sky rocketed at a local shop.