1. I recently bought 6 quarts of Mobile One High Mileage Oil 5W20 and a Wix 51516XP oil filter (this filter fits).
2. My 2003 Ford F150 4.2L requires 6 quarts of oil with filter.
3. I hired a mechanic to change the oil.
4. I then checked the oil level and the dipstick showed half quart low from...
