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Hi, im doing my first ever oil change to save money from a mechanic .. My manual says "5W-30 A3/B4 OIL like Castrol Edge Brand" .. I ended up Buying "Mobil 1 5W-30 Newer Vehicle Formula Full Synthetic Engine Oil" A1 - ...Question is what will happen if i use the A1 vs the A3/B4 thats in my...