It's always a pleasure to come back in Namibia. A nice place to perform experiences with fish-based fuels and lube oils, by the way. I have already seen some people stuffing differentials with raw fish livers, but they deteriorate quite quickly so I don't advocate for that, a better way is to extract the liver oil, filter it properly and then it can be used to lube gears, including older non-electronic automatic gearboxes, or as a feedstock for biodiesel. Some people might be thinking I gone crazy for being favorable to use it into automatic gearboxes, but the first ATF fluids were based on whale oil. Anyway, fish liver oils can also be directly blended with regular diesel fuel as I have done a few times.