Originally Posted by m4a1mustang

I actually have heard of some oil consumption issues with some of the Boss models. Depending on how much oil its consuming he should take it in to the dealer to document it. Most of them have been helpful and will replace the engine if that turns out to be the issue.

I'd send him over to The Mustang Source forums. There are a few threads on it and Ford has a dedicated customer service rep that will help him with scheduling an appointment and making sure the dealership takes care of him if necessary.