Hello all, first post after many years of lurking....This is a great forum and I would like to ask a question and get opinions...I have been using 0w30 German Castrol for years and continued using it after the change over to Belgium made...Great oil and my 2002 Chevrolet Silverado 5.3 seemed to run great with but I can no longer find it at AutoZone which is the only place that sold it in my area (Atlanta) and I wonder if Castrol is phasing it out....My question is should I go with the 0w40 German Castrol or would that be too thick for my engine which is spec for 5w30 or would Mobil 1 0w40 be a better choice?....Thanks
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