Chevy Camaro '79 (Bug?)

Hi everybody,
I’m triyng to do a good championship with my friends on Forza 6, but yesterday something strange happened.
One of the friend of mine play with the car “Chevy Camaro '79” and during all the entire race (Full Monza, 30 laps) he never made a pit-stop…
At the end of the race he had tyres in optimal conditions and enuogh fuel for further 50 laps…
What about this???
I need to explain that Chevy '79 is one of the fastest cars in game, and if he never pit…OMG no hoper for other players!
Thanks for help
Bye From Italy

Is he set for cosmetic damage only? That turns off fuel and tyre wear.