I am always confused. I had pretty good result running M1 5W30 on my integra for 8.1k OCI. You can search my result on this board and take a look. I drive moderately fast (80mph to 100mph depends on traffic) and my trips are 50miles each way and every other week 400miles each way between SF and LA. This push my tacho at 3.5krpm to 4krpm at most time. Oil seems fine in all result except the solid level, and get very dark by the time I reach late 9k to early 10k. Would it be a wise idea to just run dino to 6k or 7k? Or a filter change at 7.5k and push M1 longer (I am thinking about 15k).