Which engine oil is the best for cross 1.8v? Toyota has 4 options and 0w20 is the cheapest considering its fully syn. 0w20 is really suitable for malaysia climates? cant find how good or how bad is this oil works for toyota malaysia engine 2ZR-FE. Some SA said the oil is too thin for hot weather and shall use vis 40. Anyone has supportive information if 0w20 is bad for cross?