Well, all I have used in my reman 12.7 S60 is a Schaeffer 700 Syn blend... 10w30 in winter, 15w40 in summer. 982,000 miles on the reman. Still only uses about 1 qt of oil in 11,000 miles. Gets 22,500 mile / 450 hr oil changes. All original. Have 28 used oil sample reports on my laptop from the engine. Most recent was 1 week ago. No more wear metals in the UOA's since the first one done at 40,000 miles. Only a water pump changed out and the normal overhead adjustments done. One is going to have a tough time convincing me that any other additives are needed. But the marketing folks can sure convince owners that the the motor oil folks don't have a clue what they are doing and these additives are needed. If one uses a quality oil, operates the engine properly, and does regular services and maintenance, there really is no need to spend money on extra stuff.