Good morning to all, I wanted an opinion from you. In my life I have had a variety of cars of various brands without ever having particular problems, but, instead, I broke 3 drive motors are usually used by other people, fortunately family. All three engines have broken a connecting rod, and I can assure you that all three had a very good maintenance with oils prescribed by the house. One was the engine of the Renault 1.8 16v, a motor Mg rover 1.8 160 hp and a 2.0 twin spark alfa. According to you ? possible that the change of the guide can lead to a breakdown? Port all the cars to rev limiter, even in the climb as I get closer to the limit, but why? my last without problems, and those that use only a few days no?