AA Four cylinder, naturally aspirated
AB Four cylinder, turbocharged
AC Four cylinder, compensated
AD Four cylinder, turbocharged and intercooled
AE Four cylinder, turbocharged and intercooled designed to conform to the USA emission legislation
AG Four cylinder, naturally aspirated with belt driven coolant pump
AH Four cylinder, turbocharged with belt driven coolant pump
YA Six cylinder, naturally aspirated
YB Six cylinder, turbocharged
YC Six cylinder, compensated
YD Six cylinder, turbocharged and intercooled
YE Six cylinder, turbocharged and intercooled designed to conform to the USA emission legislation