I recently had a brand new turbo installed on my 2009 6.0 Powerstroke and... it still kinda ran like crap. Color me disappointed!!
No more engine codes, the VGT readings on the turbo were normal, no chuffing sounds from the stuck turbo vanes but it just didn't run as good as I expected, seemed low on power and just sounded a bit wrong. Also, the fuel economy was about 20-25% lower than usual and... the cold performance was awful.
There's a couple well known facts on the 6.0 (besides their reputation for blowing up).
1. They don't like being babied
2. The injectors are very prone to stiction.
I'd been having to baby mine the last couple months while dealing with the failing turbo and I'd also been remiss with my maintenance and hadn't been adding any stiction treatment to my fuel.
So, here's what I did:
a) I added a double dose of Archoil 6500 to a full tank of diesel and
b) I took her out for a long rip over a combination of steady state highway and some aggressive backroads driving.
It took about 200 miles but things started sorting themselves out by the end of my 400 mile trip the performance felt normal, I was back to averaging 15MPG and the injector noise settled down. Even better, when it's cold it runs like it should.
Before I was having trouble holding 30mpg up the hill from my house and now it pulled hard without any issues.
I've always been highly suspicious of fuel or oil additives in the past but when it comes to diesels with the HEUI injectors (The Ford Powerstroke 7.3 and 6.0) running an antistiction treatment in both your oil and your fuel seems easily worth the investment.
When I first tested using the Archoil I was surprised that the difference was even noticeable with a sound meter. It's been like 3 years but as I recall there was roughly a 3dB difference in the sounds levels between idling with archoil in the tank and without.
Here's the Archoil kit I usually buy from Amazon. (been running Archoil since I got my ambo in 2019)
https://amzn.to/3LBd50p
I've heard that Hot Shots Secret is also a good product but at less $$. I can't personally vouch for it but here's a link to check it out:
https://amzn.to/466o4Hq
(Yep, they are amazon affiliate links - gotta make a couple bucks to support the ambocampers.com website and other resources I provide )