Buying a 12000$ sled and guys are bitching about 40$ oil I have owned all 4 brands and run manufactures oil not worth the headache to switch and have a warranty fight. I tired amsoil in a ski doo third oil fill lost crank bearing dealer bitched about it but fixed it under warranty. Had to sign a agreement to use only doo oil on sled after that. Was an 800r had 4600 miles on it when sold it.