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.
4. 2013 Mazda CX-5. As one of the sportiest picks in the compact-crossover class, the Mazda CX-5 is a good bet for those seeking a vehicle that engages the driver while offering all the amenities needed for a comfortable road trip. It's also one of the most fuel-efficient picks in its class.