First of all, whats the owners manual recommended change interval??
and is that interval with conventional oil??
If it is only recommending conventional, then this oil is more than up to the task of going right up to the change interval given by the manual. Doing this will both keep your warranty in tack and will provide your engine with a long healthy life, while saving time and money over 3k changes.
Enjoy the truck and don't worry so much
=)