Denying warranty coverage is more complex than most dealers think. All the info in this post is according to Minnesota Law. If A dealer wants to deny warranty for ANY aftermarket item it is up to them to PROVE IT CAUSE THE DAMAGE. My reasoning in this matter is if you deny warranty on the entire vehicle for a certain reason you will have to prove it. When the option was available for the HO & SO the cost differences was about $550. 00,I price out with cummins both engines,they were within a $50. 00 of each other, So you could argue that DC is charging you $500. 00 more for the warranty on a HO. If the dealer contacts DC ,they will be ask to document everything, and ask to forward it to the area Rep,He will decide if coverage is deny.
Only a stupid service Adviser would go thru all this hassle and get involved in warranty issues. 99% of the dealers out their are aware off this,It is more advantageous for the dealer to fix the problem and send the bill to DC. If DC see"s a the same recurring problem with the vehicle IT IS UP TO DC TO DENY WARRANTY NOT THE DEALER. If the service department is looking for reasons not to do warranty work avoid that dealership for both purchasing and service work
If DC deny"s warranty on the entire vehicle and does not prove that the aftermarket item cause the entire vehicle to be defective you are entitle to a refund on the remaining warranty .
the remaining cost would be a matter of determination.