Explore this roundup of additives for diesel engines that improve efficiency and help reduce maintenance costs.

First up is the Cayenne Diesel, with its second generation engine for even more efficiency. The three litre V6 retains the same bore and displacement but now delivers 245 hp, 5 hp more than before ...

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Even the massively fast V8 Turbo isn’t too tragic at 24.6mpg, but it does chuck out 270g/km of CO2, and that’s 100g/km more than the Porsche Cayenne Diesel. Hybrids are the perfect ...

In October, Bobcat became the latest manufacturer to announce a Tier 4 solution that eliminates the need for a diesel particulate ... use selective catalytic reduction (SCR) exhaust aftertreatment ...