Patman; sorry, only 6 boxes of 6 each, total of 36 quarts.
This equates to 9 oil changes in my car, so at 1 change every 10,000 miles, my car will see 240,000 miles before I need to buy another quart of oil!!!!
Maybe I'll just cut the OCI to 7500 miles!
Suggestions for OCI on a 2.3 liter normally aspirated Saab? Seen synthetic it's entire life.