Pro tip: my uncle's 30 year old trick for keeping a warranty valid actually worked
My uncle Ray spent 22 years as a service writer at a Ford dealer in Bakersfield and he told me to keep every single oil change receipt in the glove box because warranty claims get denied over missing maintenance records all the time. I laughed at him, then last month my transmission went out at 58,000 miles and the dealer asked for proof of every service since day one. I handed over a ziploc bag of 14 receipts and they fixed it for free instead of hitting me with a $4,200 bill. Has anyone else had a claim hinge on paperwork like that?