I have a Husky 323L trimmer that I feel is the best trimmer I've ever owned. It's light (9lbs), has great throttle response and plenty of power. However, one thing that bothers me about it and previous Husky trimmers I've owned, is that it spews an oily residue from the exhaust. It doesn't smoke and starts and runs well usually on the first pull. I use Stihl oil in my mix but have tried other oils and the result is the same. Does anyone have a clue as to what the problem is?