TDI Hybrid: Audi Launches Next-Gen V6 Diesel for Q5 and A6 Series

[Source: Audi]

A couple of months ago I asked a simple question. Is now the right time for a TDI resurrection in the U.S.? I even suggested that Audi pair the TDI with electric motors and give us a diesel hybrid. Well, guess what? Audi has just announced a new hybrid V6 diesel engine for the Q5 and A6.

Unfortunately, it seems like this new diesel engine won’t make it to our shores. However, it does show that Audi has not given up developing new diesel engines. So, maybe the dream of a new Audi TDI in the United States isn’t totally dead.

Hybrid Powertrain

The new engine is a 3.0-liter V6 diesel. It will be offered in the Q5 and A6 lineup, producing 220 kW (299 PS) and 580 Nm of torque. For the first time, this engine pairs MHEV plus technology—which provides up to an extra 18 kW (24 PS)—with an electric compressor.

Audi’s updated 3.0-liter V6 TDI introduces an electric compressor into the MHEV plus system, marking a major technological step forward. Working alongside the belt-alternator starter and powertrain generator, the compressor forms a two-stage charging setup that delivers stronger, more precise boost and smoother performance in every driving scenario.

Electrically Powered Compressor

By eliminating turbo lag, the electric compressor enables high torque at low RPM, noticeably improving responsiveness and cutting fuel consumption compared to the previous engine. Audi says acceleration is especially enhanced: in the first 2.5 seconds, the vehicle now gains roughly an extra car length. While the belt-alternator starter handles engine startup and spin-up, the powertrain generator and electric compressor work together to add torque immediately.

Audi’s new electrically powered compressor sits after the turbocharger and intercooler, using the 48-volt system to provide extra boost when the turbo can’t—such as during sudden throttle inputs at low exhaust energy. It further compresses already-boosted air before it enters the engine, delivering instant response.

This latest generation is far more capable than earlier versions used in models like the S4, S6, and SQ5. With optimized airflow, a stronger permanent-magnet motor, and improved cylinder air supply, it now operates across the full engine speed range instead of a narrow window. The result is quicker, more linear power delivery, stronger mid-range acceleration, better efficiency, and greater durability.

Working with the powertrain generator, the compressor builds maximum boost pressure (3.6 bar) nearly a full second faster, eliminating turbo lag and creating acceleration that feels close to an electric vehicle’s instant torque. The compressor wheel can spin to 90,000 rpm in just 250 milliseconds—about 40 percent quicker than before—allowing the V6 TDI EA897evo4 to deliver its power to the road with exceptional immediacy.

Sustainable Fuel

Audi’s new V6 TDI engine is certified to run on HVO (hydrotreated vegetable oil) fuel that meets the EN 15940 XTL standard, marked by an XTL label on the fuel cap. HVO is a sustainable diesel alternative made from waste materials like used cooking oil and agricultural by-products. After being chemically treated with hydrogen, these oils become hydrocarbons suitable for diesel engines.

Using HVO can reduce CO₂ emissions by 70–95 percent compared to traditional diesel. It can be mixed with regular diesel or used as a fully renewable fuel. Audi now fills new vehicles from its Ingolstadt and Neckarsulm plants with HVO from the factory, supporting cleaner, lower-carbon operation from day one.

To see a video of how this advanced new diesel engine works click HERE.