i have a 2001 yz250f and love it. but i have been running the yamalube 4r in it for about 4 changes. at my local dealer this stuff is $8 dollars a quart. I am tired of paying for the oil. I have read about the mobile one oil. this can be purchased at my local WALLY WORLD for $4. is this oil as good as any other motocycle oil. and can i use it in my yz. i do not want anything to harm my bike motor. any info will be welcomed