Seafoam: Yes? No? When? Why?

[Pete Erickson_imp]

I have used Star Tron in my Moto Guzzi for over 6 years. When I purchased the bike the dealer said to use regular grade gas even though Guzzi recommended premium. I followed his advise for the 1st year until I discovered Star Tron. I now use premium grade and put one ounce of Star Tron in the tank with each fill up. Star Tron says that it keeps ethanol and water in suspension and stops phase separation. Have no way of knowing if that is true. However, my Guzzi has a plastic tank that does not like ethanol. Guzzi replaced a bunch of tanks under warranty and a couple of yeas ago switch to a steel tank. I have had no issues with my plastic tank and it is now 7 years old.

The reason the Guzzi dealer recommend regular was it cycles through the under ground storage tanks faster than premium. The longer gas sits, whether in the ground on in the bike, the greater the chance for water contamination.