I too am a big fan of Amsoil products. I started using their 2 stroke oil years ago. Although I am reluctant to use anything other than Kubota products at this time because my
L3560 was bought new and under warranty. My wife and I bought a new Subaru WRX awhile back. I have always done my own oil service. Big mistake !! The Motor broke a rod at 36k miles. Still under warranty but the Dicks at Subaru said that the oil changes were too far apart. I changed the oil every 5000 miles. Manual states 7500 Since I admitted to driving the car off the paved roads Subaru considered this severe use which required oil changes at 3750 miles. What a bunch of bull....The Dipshits at Subaru opted to not cover the new engine. A 6800 dollar gotcha. The fine print in the OEM manual states that off hi way use will void any warranty. I bet you a nickel Kubota has something up there sleeve as well.