This little baby can really move

We're looking to buy a vehicle, in this case a used truck to avoid delivery charges for larger items I buy about town. I detest the process of buying any vehicle. So many of the people involved in that industry tend to be

unctuous
adjective
1. Affectedly and self-servingly earnest: fulsome, sleek, smarmy.
2. Having the qualities of fat: adipose, fat, fatty, greasy, oily, oleaginous*.

*RD, did you snort at that one?