Can I add Sea Foam High Mileage to my crankcase and drive for 1,000 miles before I change my oil? [SOLVED]

Good question, Erasto. Our standard recommendation is to add it 100-300 miles before you change your oil. That gives it enough time to circulate and clean, and then allows the reliquefied residues and deposits to be drained away with the old oil. 

If you’ve already added it, you can leave High Mileage in the oil crankcase for 1,000 miles before you change your oil. It won’t harm anything and it will work to clean and reliquefy oil residues.