Expire is not really the right term; but effectively yes. In general a cheque older than six months will be considered stale-dated and will not be honoured. Reference the Canadian Payments Association FAQ.
SKYACTIV is a brand name for a series of technologies developed by Mazda which increase fuel efficiency and engine output. The initial announcement of the SKYACTIV technologies include new engines, transmissions, body, and chassis, which appeared in Mazda products from 2011.
Mazda Motor of America, Inc., doing business as Mazda North American Operations Inc., manufactures and markets cars. It offers sedans, hatchbacks, crossovers, SUVs, and sports cars. The company also provides mobile applications. It sells its products through dealers in the United States.