I am at 1600 miles into the cleaning phase and have noticed some real neat things going on. My dip stick had about a 3 inch strip of hard baked on deposits. They were so hard that you could not even scrape them of with your finger nail. After returning from a week trip I pulled the dip stick and noticed that a large portion of the baked on deposits had left. Granted about half is left, but it is just amazing to see even in the cleaning phase how this product is working. Also to note, the portion of the dip stick that I am talking about is not in the crankcase oil it is way above the fill line. I sure it will get some of the splashing that takes place. My vehicle is a 1994 ford f-150 351 windsor with 123,000 miles. I purchased it a few months ago with limited past oil change history. The oil back in the 94 day's were not as good as today's I am sure. That may explain the hard baked on deposit on the dip stick. I will take the cleaning phase to 2,500 and the rinse with Walmart Supertech oil.