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Story summary
- The Volkswagen Group's TSI and TFSI designations refer to Turbo Stratified Injection and Turbo Fuel Stratified Injection, respectively, and are used for direct-injection turbocharged gasoline engines across Volkswagen and Audi.
- The F in TFSI is branding for Audi and does not signal a different mechanical arrangement.
- There are two distinct engine families within the VW Group, each with separate engineering upgrades.
- Potential buyers should consider reliability issues linked to these engines.
