I was noticing that there was a small quantity of exhause smoke while initially getting under way. I have had this condition before and Yanmar attributed it to clogged injectors. A product was recommended as being effective in doing away with this condition. It is called Tri-D and is available at W/Marine for $20. It needs to be put in immediately before refueling and one ounce per 16 gallons. Our boat has a 50 gallon tank so four ounces went in. I did the deed today and am anxious to see how it works. I'll report back after getting some hours on the tank. John Richard s/v Jack's Place