Sorry if this is covered somewhere else, I just got my 2500 CTD. The dealer gave it to me full so today was first time I had to put diesel in. I opened the gas lid and WTH? No gas cap just a flimsy plastic insert that slides into the fill neck? Was this an over site by the dealer or do you really get a 60+K truck with no gas cap? If that’s the case any recommendations on a better solution?