Scotty wanted me to share the results of the ATS carbon cleaner he recommended. While I already take good care of my 2000 Grand Marquis, I wanted to see what this stuff would do since I bought it with 175,000 miles on it and the previous owner did NOT take good care of it. I put a lot of time and money into this thing to get it running like it should. The ATS seems to have done it's job because it's running smooth as ever! The oil in it only had 1500 miles on it and when I finished running the cleaner (for 40 minutes according to what the ATS guy on the phone recommend) it was pretty brown. Not super dark, but definitely not clean. All in all, happy car and happy customer! Thanks, Scotty!