The low oil light has been flashing on the Zip 50, so that's 1,700km to a litre of oil. On premix it would've used twice that or more, so the oil pump is sure more economical. That was Castrol TTS synth FD, which smells like some old mineral oil, I'm putting in the last of the Penrite semi synth FC I was premixing, which has the acrid synth 2 stroke smell.