Wow!! My son and I have finally gotten around to doing the carbon cleaning done. We Seafoamed the fuel. then I ran half a can of Seafoam through the intake. After that we pored the other half in to the oil fill spot in the valve cover. Ran it for 5 miles then we changed the oil after letting the engine cool off a little. That oil filter was the hardest danged thing to get out. It took the both of us working together to get the wrench in place then turned just enough to get the filter out by hand. I used to work for Good Year doing oil changes back in "2000". I never had such a hard time removing an oil filter. I blistered my thumb then removed the flesh from it in the process. A bloody mess it was. But we got it done. In the future I will pay someone else to loose the flesh off of their thumb.