So that's not on the Amsoil site? Sorry, but I would like to read this. I went from Mobil 1 (for the winter) back to dino oil (for the summer), and am thinking about switching back soon! However, Amsoil and Redline synthetics are available at Canadian Tire here in Canada, and if I can save a bit by changing drain intervals, while improving protection, I would like to do so.

98 Silver Frost SVT 97 BMW 540I Sport, six speed "Blue is for sky, black is for soil, and white is for simplicity, purity and hope for the future" "A coveted car should never stunt your life, but should make it more rich and interesting."