Did quite down the motor some. But unfortunately for me the hard starts did not get any better. Truck starts and runs rough for about 3-5 min and smokes until it gets a little warm. I will try this again next oil change and possibly shim my injectors and do new o rings on all them.
It works! Last oil change I flushed my HPOP reservoir with Seafoam, then added half & half synthetic Rotella (hard to find right now) and ArchOil to the reservoir. The engine now runs smoother, quieter and starts with ease. Hopefully this will preserve the injectors until the top-end O-rings (all of them, HPOP to the pedestal) need to be replaced. I'm convinced that Archoil not only works but will help prolong the life of the engine.
Used archoil AR9100 Friction Modifier and I am amazed at the starting/performance and fuel mileage on all my 7.3 engines. (1999 7.3 291,000 miles/ 1997 7.3 134,000 miles/ 1996 7.3 300,000 miles). Bought more for my family that all have 7.3 Powerstrokes from 1995 through 2003.
Have used archoil products in our 6.0L king ranch for years and the truck runs as good now (178,500 miles) as it did when new with no major repairs. AWESOME PRODUCTS.
Waiting for my next oil change to use my latest order, but the shop that I trust with my truck has used this in the past on my truck and it solved all my hard starting issues during cold weather. Great stuff!