From Xcel web site, its all snake oil.
Dear Sirs,
I'm a fish spotter and fly the Chesapeake Bay area and along the eastern seaboard. We routinely put between 1,200 and 1,500 hours a season on these light aircraft. Prior to using Xcel Plus we were having considerable problems with valve guide wear which would cause considerable overheating and stresses in the cylinders. We were using Avblend and it could not alleviate this problem.
In 1994 I put a new engine on my aircraft after sufficient break-in, I used your Xcel Plus Aircraft Engine Protection. Since the, I have flown the aircraft over 3,500 hours.
When we have pulled the cylinders for inspections, we have found very little wear. To date we have less than .001 wear on the cylinder bore. I have noticed an increase in fuel economy, a decrease in engine operating temperature and a much smoother running engine.
Yours, truly,
Harold C. Rittenhouse
Commercial Pilot
Dear Sirs,
I'm a fish spotter and fly the Chesapeake Bay area and along the eastern seaboard. We routinely put between 1,200 and 1,500 hours a season on these light aircraft. Prior to using Xcel Plus we were having considerable problems with valve guide wear which would cause considerable overheating and stresses in the cylinders. We were using Avblend and it could not alleviate this problem.
In 1994 I put a new engine on my aircraft after sufficient break-in, I used your Xcel Plus Aircraft Engine Protection. Since the, I have flown the aircraft over 3,500 hours.
When we have pulled the cylinders for inspections, we have found very little wear. To date we have less than .001 wear on the cylinder bore. I have noticed an increase in fuel economy, a decrease in engine operating temperature and a much smoother running engine.
Yours, truly,
Harold C. Rittenhouse
Commercial Pilot