I'll probably regret this... but:
When the regional rep happened through the shop and my truck was there getting something looked at (unrelated to engine) and the rep noticed I had a power box he went to the DC computer and immediately voided my engine warranty. He had every right to make a notation to pay close scrutiny but to void it outright was nuts. Think Magusson-Moss saves you? Ever hear of the EPA? You do anything to possibly modify the emissions and they can void anything they want. I'd rather be my own warranty station anyway since they break it ever time they touch it -- but buyer beware so-to-speak.
This is personal opinion based on several years observation:
Take note that the DC reps bonus and job security is based on
DENIAL OF SERVICE.
Not SERVICE, DENIAL OF SERVICE. Get it? If they spend too much money on repairs they get a lower rating and less bonus, so they are given an incentive to avoid warranty repairs.
That's also how dealers get "five star ratings". That rating is in large part based on how much money they save DC by avoiding warranty repairs. They do too much warranty work, they get lower rating, no five stars.
Think the "customer survey" balances out the incentive to save money by avoiding warranty work? THINK AGAIN! You talking about that survey card you get with the repair ticket when you check out? How many have you seen? Not many? Could that be because they fill them out for you? They check how great their service is and send it back and you never see it. Presto, magic. Crummy service but excellent rating.
If it's Five Star: It's
Five Star Denial of Service.
Jusy my opinion. Love my Dodge, Love my Cummins, Hate Dealers in General.
The above holds true for all of the big automakers, although DC is way worse since the German's took it over (note the collapsed profitability of Chrysler since Daimler). If you're lucky you have a dealer that has enough volume to push back on DC and can get you good service. Most aren't that lucky.
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Big MAK
98. 5 ISB 5spd 4x4 Quad Cab 3500, 275s and Original PowerMax
A "WARRANTY FREE" ZONE
https://www.turbodieseltrucks.com