Originally Posted by husk

FSS also adapts to your driving style, it reduces the amount of time between service intervals if you drive your car hard. It also calls for a service a or b depending on how hard the car is being driven. For example on my car it called for 3 A services in a row now I am 3000 miles away from a B service. Sometimes it alternates between A and B services one after another, it all depends on how hard you drive you car.

I have the 00+ cluster not the 96-99 cluster which tells you how many miles you are away from a service but that also is based on how hard you drive your car.