Recent content by trafgoo

Now if Valvoline would come up with a simple, easy way to clean the carbon off GDI intake valves that doesn't require taking off the manifold...

The fuel mileage of my 2014 Mazda 3 has went down, and live data on the scan tool indicates some things that aren't quite up to snuff but not bad enough to trip a code yet. I've tried some other fuel system cleaners (Redline, ATS). And just replaced the plugs since I suspect the previous ones...