You use fully synthetic two-stroke oil anyways, right? Low deposit formation, low smoke etc. But one thing: When you read about two-stroke oil at various manufacturers, for semi-synthetic it says "low deposit formation" while for fully synthetic it even says "increased cleansing of the engine and exhaust system". No doubt that fully synthetics will keep a new engine sparklin'. But are the oils and additives really that good today that they can actually clean the combustion chamber and exhaust from old deposits left behind by dino oils?