- :
- Canada
A full can just before an oil change, most in the engine itself and some in the gas tank.
I just changed my oil with Pennzoil UP and the engine is noticeably quieter and smooth.
Mpg is a bit better but not like before.
I'm thinking it's combination plugs, tires and maybe carbon buildup for the additional mpg losses.
Interesting! I'll try a can in the engine oil and a can in the fuel tank when it's halfway to empty before my next oil change in the fall. I'll probably also do an intake/throttle body cleaning as well. I haven't done any of that on this car, so maybe it'll help my mileage a bit.