Quote Originally Posted by aaronng View Post
The current Honda engines (Jazz, Civic, Accord, Accord Euro, CRV, Odyssey, S2000, Legend) can use 0w-30, 5w-30, 10w-30, 0w-40, 5w-40 and 10w-40. Even 15w-40 and 0w-20 might be usable. Generaly for the SAME TYPE OF OIL, the thicker the oil, the better the protection (as long as you stay within the appropriate range), while the thinner oils give better fuel economy.
But I have always thought that 10W30 will have around 60cSt at 40C that will provide a faster flow around the engine for first crank start-up while 5W40 will have around 70cSt at 40C. Most wears do occur at start-up, wouldn't 10W30 flows better in the first few critical mins.