I have a Exmark Lazer Z XS, 66" cut. I bought this mower in March o7. The mower has 511 hrs. on motor. I told my dealer that the motor was using oil. You can smell the oil. The dealers stats that the rings is bad. He told me it is not under warranty. He stats that Briggs will not warranty to work on the motor. He told me to keep using clean Briggs filter until it goes bad and then he would tear it down and fix it. ( at my costs) I buy new exmark mowers every two or three years. I would like to know if any of you are having problems with your 35 Briggs Vanguard. Why don't Briggs warranty this motor.