What kind of oil does the dealer use ? As long as it's "brown and slippery", anything goes ! At least according to this guy :
( he is talking about Toyotas, not Ram's by the way )
It's a 45 min video of an engine tear down and short block replacement. Guy's theory is that even though Toyota says 10k oil change interval you should never mind that and do 5k or 6 months which ever comes first and that's it cheap insurance if you plan to keep the vehicle a long time, Especially since the dealership uses the cheapest oil they can get their hands on that meets the spec for the engine - Or so he claims anyway, ( the context of the 'brown and slippery' remark he makes early in the video ! )
There may be some truth to it, who knows. I will say that with my '07 Subaru Outback I gradually lost all confidence in the local dealership to do anything right ( one time they forgot to put the plastic cover / fascia back over the top of the engine, which I didn't discover till a few days later when I went under the hood for something, top off the washer fluid maybe. Went back to them and they found it "out back somewhere" !! When you catch them in those sorts of basic attention to detail things you then start wondering about where else they cut corners that you don't see. )