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What car is that? Does it already have a DPF? If it doesn't have that, you'd be supposed to be safe with some vegetable oil blend (up to 20%). With some pre-heating of the fuel, you could even try 100% vegetable oil. If the car is fitted with direct injection, it would be advised to crank on regular Diesel fuel and allowing the engine to reach its operating temperature before switching to the veg oil. Some older irons with indirect injection on the other hand tend to deal better with veg oil.
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