Checking to make sure that the owner of the vehicle has kept up on required maintenance in accordance with posted / established criteria is absolutely a responsible and necessary action. There’s nothing unethical about it. Improper maintenance can indeed cause premature valvetrain damage, so step one is to assure that proper maintenance has been properly performed. The manufacturer who backs the warranty has the obligation to honor the warranty, provided the maintenance has been done according to their clearly defined requirements, the vehicle owner has the obligation of properly maintaining the vehicle if they wish to maintain their warranty. The dealership checking to make sure the maintenance has been done, and that no one has in any way modified the vehicle or tampered with it, is only doing its due diligence in protecting both their financial interests (the dealership) and the manufacturer’s they represent as well. I’m failing to see how that is in any way “unethical” or “nonsensical”.
If the maintenance and lack of tampering all check out, they move on to deeper diagnostics.
If both parties are doing their part in the arrangement, there should be no issue.
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Cummins posted a loss because they’re still getting their a$$ handed to them for the whole “emissions cheating” scandal. Which, by the way, isn’t what it’s portrayed to be by left-leaning media. No one was cheating. They did what they were approved to do, and then when the regime changed at EPA, the new regime “didn’t like” (or agree). Rather than get stuck in a legal battle which would’ve cost them ten fold, (and could’ve been un-winnable) they struck a deal and moved on.