Audi introduces its own fuel saving technology called “Fuel Stratified Injection” (FSI) on the 2.0 liter Turbo FSI and 3.2 liter V6 FSI petrol/gasoline engines. Due to the introduction of FSI, the 3rd generation of Audi A4 is equipped with four-valve per cylinder design (the 1st and 2nd generation of Audi A4 is running on five-valve per cylinder).





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