I've tried both oils and I found the volatility of the 0w-30 to be too high for my engine. I have an Acura RSX which has 160hp 2.0L four. I'm running the 5w-30 now and my oil consumption is too low to measure after 2000 miles. The 0w-30 may be OK for really cold weather but I wouldn't recommend it for mild climates.