I have never had a warranty issue that could bring into question any maintenance work that I had done but a maintenance log (in my case, a piece of paper with dates and mileage) and receipts would be sufficient proof. There is no concept of "unauthorized maintenance". Either you have records to show the work was done (by whoever you choose, including yourself) or you don't. In the case of a dispute, the burden lies with the dealer to show that the issue is not caused by a defect. Google the Magnuson-Moss Warranty Act.
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Originally Posted by Topspinmo
Is your vehicle under warranty? Especially if Asian? If so I hope you are saving the recipes with the date on them for your oil and filter, record in the maintenance logs, and keep exact historical records of what you did? If not most likely if you have oil related failure they might not honor the warranty. If out of warranty don't matter.
Basically the dealer manufacturer wants to do and control all maintenance while during the warranty period and of course after. Even though I can do most servicing. I don't while the vehicle under warranty in case there major problem.
First thing they going to scream unaurthized maintenance done which void the warranty.
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