I noticed that the oil in my car gets dark brown at around 4k miles. I have about 7,000 miles on Redline 5w-20 right now, but even with M1 previously and the factory oil, I noticed it gets fairly dark. Many of you say that the oil is still clear after thousands of miles. I'm thinking either I didn't break-in the engine correctly, or it's just the nature of the engine. I varied the rpms a lot the first 1k miles. Hit 4,500 rpms now and then while breaking it in. I'm thinking that I'm getting blow by which is darkening the oil?? I know that fresh RL in a bottle is kind of dark but when I first do an oil change, it's fairly light brown on the dipstick. Now I also have to consider the fact that this car sees 80-90mph hour long drives 2x a day with frequent redline shifting. Only way to tell will be when I do a UOA which will be shortly. My daily commute is going to lengthen, so I picked up a Amsoil Ea oil filter ($19!) and plan on running RL 5w-20 as far as the analysis says I can take it. This report that I will be sending in will be more like a racing UOA.