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 partnered with the Ford Motor Company from 1979 to 2010 and helped to develop vehicles such as the Ford Explorer. Mazda, along with its competitors, pursues cutting-edge innovation and development. Mazda has made a reputation for itself as a company that makes cars that are fun to drive.