Peter wrote: Using the Mobil 1 0W20 method Just saw this: https://www.mobil1.co.uk/synthetic-engine-oils/esp-x2-0w-20.aspx?tabs=specifications#tabs warning… Apparently, your method is more widespread, so that Mobil saw a need for a warning ;-) “Mobil 1 ESP x2 0W-20 is not recommended for 2-Cycle or aviation engines, unless specifically approved by the manufacturer.”