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Don't Know much about Mazda, Honda, and Mitsubishi Engines.
Toyota has engine Families in this Designation style
For instance, the 4-AG stands for the fourth generation of the A engine family.
Also, the engine used also has to do the chassis designation.
ie the A(4-ag engine) E(Corolla/Sprinter Chassis line) 8(th generation) 6(don't know quite why they use the six)
Every Toyota chassis and engine family follows this convention.
Toyota has engine Families in this Designation style
For instance, the 4-AG stands for the fourth generation of the A engine family.
Also, the engine used also has to do the chassis designation.
ie the A(4-ag engine) E(Corolla/Sprinter Chassis line) 8(th generation) 6(don't know quite why they use the six)
Every Toyota chassis and engine family follows this convention.