I have had ams oil by pass filters installed on vehicles before. I still have one settin in the shed. I got tired of paying outragous bucks for the bypass. I decided to just change the oil more as it was less than the cost of the bypass (buying the big one). Having nearly 2000 mi on my truck I am concidering dusting the thing off again and installing it. So here is the ??? What is the cost on those things now? and what oil are you guys using with it. My budy sells the stuff and is all he uses in every thing he owns. gear oil, transmission fluid, hydralic oil in skid steers, deisel oil you name it. And I have a neighbor who sells Shaffers oil. I hate to throw money away on special oil. Especially when I have a 55 gal barrel of John deere 15/40 plus 50 oil in the shed for all othe the other machinery around here???? They run fine for 10000 hours with this oil. Isn't it good enough???