I've seen it save people alot of money on a couple of Stihl products, we just want the consumer to get in the habit of using Ultra which has 20% more lubricity than the orange bottle dino, 40% more detergents to keep the carbon out and a additive that protects all the brass and copper parts in the fuel system from water and ethanol, you can buy a six pack of one gallon bottles or a two or two and a half it doesn't matter and we register it for you. With the Stihl program, you don't need to buy the quarts of pre-mix.
I had a customer last Thursday come in and say the local Husky dealer voided his warranty because his week old 460 locked up and the dealer tested the fuel and said it was 12% ethanol and that voided the warranty, couldn't help him. I realize there are two sides too every story but we were glad to give him 40.00 for his 460 for a parts saw and sell him a new 311, we have the same policy anything over 10% voids the warranty, but I'm not voiding a warranty for 2%, a person could add a drop or two of water above the line for water and throw the test off.
Remember the warranties are only for mfg defects, I've seen the added warranty get a person a new carb after 3 years on a blower due to a leaking welch plug and also seen it get a carb replaced on a bad needle seat.