Here's the first Valvoline Restore and Protect experience I can share.
This is entirely unscientific and unsupportable.
I read about Valvoline Restore and Protect here and wanted to see if I'd catch any sludge.
Maintenance records lead me to believe my engine was well cared for, so there's also an entertainment factor I won't deny.
4,280 miles were on my 1st round of Valvoline Restore and Protect. The used element filter was clean as could be.
However, the new Valvoline Restore and Protect made the engine run much more quietly.
I understand the effect might be psychosomatic but I'm not given to such frailty. All but one of my grandparents were Vulcans.
I intend to do the 4 changes.
The reports here of Valvoline Restore and Protect possibly having a shorter duty cycle AND the quietness I believe I heard, will have me doing my subsequent Valvoline Restore and Protect changes at 3,000 to 3,500 miles.