I love how many people bash AMSOIL and their so-called marketing. I see more marketing for other oils than I ever see for AMSOIL. However, after using AMSOIL I won't use anything else. And as others have stated becoming a PC helps to cut the cost down because you get 25% off each time, and often times I get free shipping as well. My oil analysis for running SS at 10K intervals from Blackstone tell me that I can go another 10-15k miles every time I send them in. The fact that the oil comes out still golden and see through at 10K also tells me the oil isn't near end of life. However, I am going by Toyota's recommendations of 10k oil changes. I have never had any issues with any of my Toyotas doing this. What we pay for vehicles now I would rather not skimp on the oil that I use. I do know there are a lot of good oils out there, and as long as you are changing at a reasonable interval for the oil that you are using then you shouldn't have any issues. However, I still don't know why people bash AMSOIL so bad especially if they have never used it.