I recall you had the fluid tested from your car (
http://www.m3post.com/forums/showpos...49&postcount=1) and the fluid was found to be in very good condition with 30k miles. With that in mind, why did you change it on the second vehicle? Have you continued to get the fluid tested and if so, have you found a point (i.e., mileage) where the degradation is noticeable?