Diesel engines might not be the first thing you think of when you hear the term ‘low emissions’, but Audi is on a mission to change that and keep the internal combustion engine alive a little bit longer.

Audi has approved some of their V6 diesel engines to run on vegetable oil. Not diesel. Not petrol. Vegetable oil.

It’s a biofuel called Hydrotreated Vegetable Oil, and they reckon it will result in a 70-95% reduction in co2 emissions.

It almost sounds too good to be true. So, what is HVO, why is it so good and is it the future for diesel? Let’s get into it.

It’s worth noting that people have been running old diesels on waste vegetable oil for quite some time now. You can trawl through all the different forum threads from people asking if they can run their car on old chip fat.

It just makes sense. Who wouldn’t want a renewable fuel that’s cheaper than the stuff you get from the pump? You could use the cooking oil from last night’s dinner to get you to work.

In theory, any diesel will be able to use vegetable oil. After all, the inventor of the diesel engine, Rudolph Diesel, actually ran his early engines on peanut oil.

Unfortunately, it’s not quite that simple.

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