Thanks for the fast response. I'm currently using Mobil 1 but was linked to this oil test on your website. It made me decide to give your stuff a try.One of our participating dealers lives just a few miles from you in fort Mitchell and he will be happy to take care of you. please e-mail me your contact information at [email protected] and I will copy him in on it and hopefully he will have the right price for you. Are you presently using Amsoil?