lefty976

Hi fellow civic enthusiasts, I know that the 9th gen civic uses the same engine and tranny but it gets alot better gas mileage. Is this due to using 0w-20 motor oil and low rolling resistance tires? The 8th gen uses 5w-20, anyone using 0w-20 with better mpg?

MindBomber

0w-20 does net better gas mileage, it's just a bit more expensive and harder to find than 5w-20 or at least was when the 8th gen was released. I've heard 0w has been recommended by Honda in Europe and Japan for a few years already.

lefty976

Does anyone know what the oil change interval is if your using 0w-20 since it is fully synthetic vs 5w-20 which is conventional?

gearbox

iTrader: (95)

its mostly the fluids and tires, possibly a bit of aerodynamics. i have seen hybrid civics with a difference of 10mpg just on the tire choice. dw1 full syn atf, 0w20 full syn (or blend in some cases) motor oil. i have to admit im really skeptical about using these lower weight oils. 5w30 has always been the best all around oil even for a new honda. i suppose you can use a 0w30 if you live in colder climates, but going to a 20 hot weight is eventually gonna catch up to you. i remember at first they were only recommending this for hybrids, now its for all the civics and the engine designs have not changed between then and now.

lefty976

Is anyone running 0w-20 in their 8th gen with any improvements in mpg?