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 STARTS PRODUCTION AT NEW PLANT IN MEXICO. First model off the line is all-new Mazda3 sedan for the USA. Hiroshima, Japan, 7 January 2014: Mazda Motor Corporation today announced that production has begun at its new plant in Mexico. The plant, named Mazda de Mexico Vehicle Operation* (MMVO), is located in Salamanca, in the state of Guanajuato. The first model produced was the all-new Mazda3 sedan for the US market.