I purchased a 2009 LX426 Toro Lawn Tractor in June 2009. Within two years (35-40 hours) warranty work from my dealer was required for a loose rocker arm (no warning, engine just failed with loud noises). The rocker arm bolt was lock tighted and valves adjusted. It ran again for another 2 years, with the engine going again at 71 hours (same noises as before when engine cut out). The Briggs and Stratton Intek 20 hp Engine now needs replacement according to the dealer. This lawn tractor has been very well taken care of and used for my lawn only for the past four year.
Is this common for these Toro lawn tractors and B&S Stratton engines?