I agree with Dino, just pour the synthetic in and use it. If you have a problem with too much oil use after you try it, THEN turn it down. But, stay at a quart per tank of gas. If your using a quart per tank of gas and your plugs are fouling, then you need a jetting change, not an oil pump change. For example, I experimented last summer with Klotz in my weed whip. It ran rich and had a totally black plug. I put in a 25:1 ratio of Klotz to gas and it smoked pretty bad. I then leaned it out to a good dark brown plug (same black plug) and it actually cleaned all the fouling off of the plug, stopped smoking and ran great! Being jetted properly is the #1 issue, oil use is second for smoking and fouling plugs. Even at 25:1 ( a very high amount of oil in the gas) the Klotz cleaned the old black plug and it looked brand new. That is what sold me on the Klotz. Good Luck.