Hi, I thought I'd share with you. 20000km ago, I started using WVO+diesel blends at various concentrations. I just replaced the fuel filter after the first 1:3 WVO tank run, for safety reasons. What oil I use? Waste sunflower oil, used in deep fryers, cooking lot of french fries and some meat or cheese (samoussas, nems, bouchons...). I collect it at local snacks. How I filter? First, I let it settle for one month. More or less of white gunk forms at the bottom of the bottles. I then use a funnel, a cone grill and a non-woven compress to filter the oil using gravity. Pic attached. If some white gunk drops, it clogs the filter, no big deal Will it blend? After filtering 15 liters approximately, I pour in a leftover White Spirit bottle and some 2 stroke oil, or some gasoline and 2 stroke oil. Seemed to me that it prevents separation of the blend when mixed in diesel fuel then. How it runs? In my DW8 Peugeot Partner L4 1900cc diesel engine (naturally aspirated!) (IDI, Bosch VE) Starting can be rough when more than 25% WVO on cold engine (like some alternate misfires) but 20 seconds of fast idling ends the issue. Then, even fully warmed, the engine can feel racy at low rpms light loads, shaking back and forth on worn engine mounts. Full throttle runs really great. I even managed to get away from a dry tank buying virgin sunflower oil and mixing with ethanol (burning alcohol) to get to a gas station. Does it smells? Definitely, half like french fries and diesel. Any comments appreciated.