nope.
now i cant use my engines legally, i went to 100:1 for a while just to experiment... still running, last time i went for a blat
and i made sure i used a full 4 litres of fuel on that ride, at WOT.... or about 300 km or so.
just use decent oil. synthetic is overkill and a waste of money.
even castor oil at the chemist works
though it makes a mess, it smells great!