Not sure if relevant, but I did wonder whether the catalytic converter might have been damaged on the 1st start as it got very hot (glowing red) due to unburnt fuel igniting... How common is that in a road car? I thought that the references to afterburners were metaphorical, even in a 420R... :-) What Ian says. Have you still got the liquid? Pass it through filter paper and then test samples to see if they dissolve in water or in petrol. Test if it ignites or burns. Usual precautions, especially about where you do this bit.Jonathan