hey man
where do you live?
ill help you out with the metric mixes cause im aussie and that what we use
for 5L of fuel add 160mL of oil
10L of fuel add 320mL of oil
20L of fuel add 640mL of oil
thats a 32:1 fuel mix ratio
i buy 4 litre bottles and use a 1 litre oil bottle to measure my oil, it doesnt have to be exact.
what oil are you using, fully synthetic, semi sythetic or mineral, might have somthing to do with the smoking as well
hope that helps