Hey guys!! I am currently trying to decide whether or not to change my tranny fluid. I have a 1998 Chevrolet Monte Carlo in addition to a GMC Sonoma pickup. I bought the car back in November 2001 with 27,000 miles(approx.) on it. It is a four speed automatic with the 3.1 LV6 motor. My real question is why does the owner's manual suggest I not change the tranny fluid unless I operate the car in severe service?? Is the Schaeffer's tranny fluid a good product and what brand of tranny filter have you guys had good luck with? When I buy a vehicle I usually keep it for a long time so I'm not worried about cost. Any suggestions or advice would be appreciated.