Rod - I am assured that should there be a problem, they will be available to work with me. Nothing in writing but I don't feel I need it when dealing with Roush and these two guys in particular.
Madmaxx - Detonation was the explanation. I use Chevron, Shell almost exclusively.
Oil has either been Valvoline 20/50 Racing, Castrol 10/30 or Mobil 1
synthetic 10/30. I am a Sunday driver so abuse is not a factor.
Roush 1 - I personally can not answer that - speak with Todd or Mark.
Tom