How do you maintain your vehicle? Did you know that most real life driving conditions fall under a manufacturer's "Severe duty" interval schedule? Also, many component manufacturer's recommend intervals different that what the vehicle manufacturer does. - For example, ZF recommends transmission fluid changes every 60-75k miles, while Land Rover manual states 150k/10yrs for most vehicles after 2004. What do you feel is best for the longevity of your vehicle?