I bought a used Honda 4 wheeler a few weeks ago. The color of the oil was fine, but I decided to change it. The day before I changed the oil, I added 2 oz of Seafoam to the crankcase and rode the 4 wheeler for about 30 minutes, then rode it again 15-30 minutes the next morning, before changing. The oil was jet black when I changed it. A week later, and after riding some each afternoon, the oil is still honey colored. I used Honda oil and filter.