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.
The Mazda3 is made in the Mazda de Mexico Vehicle Operation plant, is located in Salamanca, in the state of Guanajuato. The first model produced ever made at the plant was a a U.S. market Mazda3 sedan that emerged on January 7 2014.