Brother if 10w-30 isn't suiting, then you may first try 10w-40, preferably by ZIC. To me, its the only value for money, fully synthetic engine oil available here locally in 10w-40 grade (rest are either semi synthetic, synthetic blend, or mineral, etc.). Secondly, it meets the latest API SN criteria (others might be stuck below SN grade, i.e. SM or below).