With NMF, after the engine has been cleaned your oil will run cleaner and last longer. For example, with NMF conventional oil in a semi truck should still be good at 40,000 miles -- just change the oil filter at 15,000 and 30,000 miles. You can verify this with oil analysis. PROCEDURES: Run NMF for a normal oil change interval to clean the engine. Change the oil filter and oil. Unless the engine was extraordinarily grimy and a little residue remains, the engine should now be perfectly clean. Add NMF. Do your first oil analysis at the normal oil change interval. The report should show that your oil is still good. Continue conducting oil analysis incrementally on the way out to 40,000 miles at each time verifying the status of your oil. Remember to change the oil filter at 15,000 and 30,000 miles. Any time you top off the oil, add 1 ounce of NMF for each quart of oil you add. Use the below chart to record your data.