What are the differences between the Audi A4 45 TFSI and the Audi A4 40 TDI?

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Maria Sánchez 1 hour ago

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What are the differences between the Audi A4 45 TFSI and the Audi A4 40 TDI?

I am deciding between these two engine options for my Audi A4 and want to know the specific differences in terms of performance, fuel efficiency, and maintenance costs.

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**John Smith** · Answer 1 · 2026-08-10T09:35:04+00:00

The Audi A4 45 TFSI has a turbocharged 2.0L 4-cylinder engine, while the Audi A4 40 TDI has a 2.0L 4-cylinder diesel engine. The TFSI has a higher horsepower and torque, providing better acceleration and performance. On the other hand, the TDI offers better fuel efficiency and a longer engine life.

What are the differences between the Audi A4 45 TFSI and the Audi A4 40 TDI?

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