The law (Magnuson Voss Warranty Act) is very clear: You do not need to do oil changes at dealerships, nor even use OEM parts.
Despite lots of FUD intended to profit from $250 oil changes and $400 alignments, I have never heard of warranty denied for non-dealer oil changes. Usually it's due to mods. After a lifetime of being happy at indies and wasting many hours at dealerships, I've gone back to indies for the rest of my warranty period.
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Does Working on Your Own Car Void the Warranty?
This is a common misconception. You absolutely can do routine maintenance on your own car rather than taking it into the dealership. Feel free to change your own oil, rotate your tires and even do repairs like fixing your brakes. All you need to do is keep the receipts for any work you perform, so that you have them on hand in case you need to make a claim.
What About Outside Mechanics?
They can work on your car, too, and that won’t void your warranty either. Whether it’s routine maintenance or a repair, feel free to have the work done by a mechanic you know and trust. Just like doing the work yourself, however, you need to hold on to any receipts so that you can prove the work was done.
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http://knowhow.napaonline.com/the-ma...ral-lemon-law/
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It’s illegal for an automobile dealer to deny warranty coverage just because routine maintenance or repairs were performed by another person or business. “Routine maintenance” generally includes things like an oil change, rotating tires, replacing belts, fluid checks and flushes, installing new brake pads and inspections.
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https://automotiveaftermarket.org/ma...-warranty-act/