wooooah let me get in on this, you guys should all try amsoil, amazing stuff, if you change your oil and filter every 3 months or 3,000 miles like they recommend, you spend well over $75 a year to do it, but if you buy amsoil and get an amsoil filter you can go one year or 25,000 miles on an oil and filter change, which will only cost you around $45, plus its less time you need to spend under your vehicle and more time chasing the ladies or doing your favorite hobbies. i put amsoil sythetic in the engine, trans, transfercase, and diff's and got a 2mpg increase, and i noticed my jeep wasnt as sluggish for the first couple blocks on cold mornings. everyone i know that has a manual trans and uses this stuff says its ten times easier to shift when cold. give this stuff a try, you wont be disappointed