IDK if my engine has gotten too use to it, but if I run a lubricant and cetane booster separately, engine is a tad too noisy. That is until I run the forementioned additive.

 

 

If I understand right, you will run the Power Service stuff and the engine will be quieter than when you add a lubricant and a different cetane boost. Maybe the separate cetane boost has a higher concentration of cetane and the added cetane makes it run louder.