No I've had good luck with them and seen many high miles Police use ones. I've seen some failures too in Police use but also questionable maintenance on those. We had some usage of whatever weight oil was around in some of ours along with the oil levels not being checked frequently enough. And really I've seen more failure on early Pentastars too than 5.7's. Even our pre Eagle Heads 5.7's have been good, as have the 3.5 V6's. The 3.5's have been absolute workhorses!!! I don't care what anyone says about them. They just take the abuse and keep going!