Audi Sustainable fuel, lower emissions: Audi approves many of its V6 diesel engines for use with renewable fuel

Like the entire Volkswagen Group, Audi is pursuing the vision of carbon-neutral mobility and wants to achieve net climate neutrality by 2050. The focus is on vehicles with electric batteries. In addition, Audi is increasing the environmental sustainability of its combustion engines: The company has now approved many of its current six-cylinder diesel engines for use with the renewable fuel HVO (hydrotreated vegetable oil).

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[Rolf]

I remember in the 80's there were many farmers in South Africa using Sunflower Oil in their older Diesel Vehicles as fuel.

Here is an interesting article about the pros and cons of using Sunflower oil

Can You Really Use Vegetable Oil to Fuel Your Car?

Vegetable oil as a fuel? While it certainly is an option for a few engines, we're probably a long way from using last night's grease as the fuel of the future.

auto.howstuffworks.com