Retailers often use these phrases interchangeably in marketing, but the requirements differ:
: Ran a "National Buy 3, Get 1 for $1" event during October 2017 for OEM, OEA, and WIN tires . buy one get one free tires 2017
: Extremely rare and usually limited to specific, lesser-known brands or clearance inventory to drive foot traffic. buy one get one free tires 2017