Will buying with American Express double your warranty?

Neverlost99

Member
I use AMX for everything possible I like the Hilton points and the offer to double the manufacturer warranty. On my upcoming Yamaha with a three year warranty looks good. The exclusion is motorized device. I wonder if it would cover the battery?
 
I use AMX for everything possible I like the Hilton points and the offer to double the manufacturer warranty. On my upcoming Yamaha with a three year warranty looks good. The exclusion is motorized device. I wonder if it would cover the battery?
They’d be silly to take that on.
 
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