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 was given an overall score of 75. Consumer Reports said Mazda is a brand that understands itself and replicates its sporty DNA in every new car it makes.. The automaker received a road test score of 76, tying with Lexus, and was one of the better rated companies in terms of reliability.