The 911 contains alcohol, thats a big no no in our powerstrokes!

 

Absolutely!!! Alcohol is the most common emulsifier.

Back to the OP's question:

Motorcraft diesel additive should, in theory, be the best option. Receipts & records kept on use of the recomended product, is, IMO, the best way to retain warranty.

 

Here is a link to the Spicer Study from 2007. If you haven't seen it, it is the only study that I am aware of that compares the different additives.

Lubricity Additive Study Results - Diesel Place : Chevrolet and GMC Diesel Truck Forums

 

the study is from 2007 - any update for what works best in the 6.7L?

also, in searching old threads, someone said the study is bunk...no clue, just passing on what i read

as i said above, i went with the stanadyne - i'll let you know how it works!

 

Regardless of when the study was conducted, I don't see how that matters other than potential reformulation by the manufacturers. I would be concerned about two things when considering an additive. 1. Demulsifiers present, emulsifiers absent. 2. Lubricity.

 

Stanadyne seems to cover it:

The premium all-season, multi-function diesel fuel additive, designed to tackle virtually any diesel fuel related problem.

•Meets all fuel system requirements regardless of make, model or year
•Approved by Original Equipment Manufacturers (OEMs)
•Cold Weather Protection - reduces diesel pour point up to 40�F (22�C), and cold filter plug point by up to 25�F (13�C), depending on base fuel
•Hot Weather Protection - lubricants and cetane improver help when fuel is hot and "thin"
•Increases Horsepower - with up to 5 point cetane gain to improve combustion, resulting in better acceleration, power and torque
•Reduces Fuel Consumption - independent tests show gains up to 9.6% in MPG
•Easier and Faster Starting - in all conditions
•Reduces Smoke and Particulate Emissions - and is suitable for ultra low sulfur diesel
•Cleans and Protects - detergents and deposit modifiers help protect injection pumps, injectors, nozzles, etc.
•Reduces Wear - lubricity improvers restore lubricity to ultra low sulfur and other low lubricity diesel fuels
•Stabilizes Fuel - antioxidants keep fuel fresher
•Fights the formation of corrosion and rust
•Contains No Alcohol - avoids corrosion and accelerated wear
•Helps Remove Water - special demulsifiers cause tiny water droplets to come out of suspension/emulsion, so the filter/separator can more effectively remove water
•Specially Formulated for use with ultra low sulfur diesel fuel
•Can be used with Bio Diesel Fuel up to B20 (20% bio content approved ) - increased water separation shown in bio content up to B20

 

as an aside, Ford itself recommends additives - this comes from page 24 of the Diesel Supplement (5th printing)

Diesel fuel conditioner
Additives that will improve fuel cetane numbers may be used to
verify/enhance fuel quality. Use Motorcraft or an equivalent cetane
booster & performance improver as listed in the Maintenance product
specifications and capacities section in this chapter. The customer
warranty may be void from using additives that do not meet or exceed
Ford specifications.
Do not use alcohol based additives to correct fuel gelling. This may
result in damage to the fuel injectors/system. Use Motorcraft or an
equivalent anti-gel & performance improver as listed in the Maintenance
product specifications and capacities section in this chapter. The
customer warranty may be void from using additives that do not meet or
exceed Ford specifications.

 

Am I missing something on the Stanadyne, the performance formula ranked 12th with only a 33 micron improvement. Have they made some major changes?

 

For those of you using PM-23A in the winter...why may I ask? It's my understanding that northern climates switch over to a winter blend fuel that does not gel like straight #2 so no additive is required. I can understand if you are in climates that reach -50F temps that an additive might be required. I've had no issues running PM-22A all year round in Michigan.

 

Not that you didn't see it somewhere, but I have never read anyone contesting the validity of the test. It was a blind study contracted by one of the other diesel forums, not sure where the complaint would be. Doesn't seem that there was any conflict of interests. Always one in any group I guess, I'm sure they gave not other details other than it was "bunk".

Someone on here said that Optilube was bad for engines and they had seen it and Ford had voided some warranties because of it. However, when I pressed for more details I never got any, so take it for what's its worth. That was the only thing I had heard bad about Optilube.

In the end I think some additive is better than none. Which one is up to you.

And no, other than another very small article in a diesel mag that did a test on only a few additives (by the way backed up the good results for Optilube) there have been no other tests that I am aware of.

 

I wonder how a manufacturer of a diesel fuel additive that makes a claim "increases cetane up to 5 points" came to this conclusion. Up to 5 points, did they pour 10 oz. of their product in to a gallon of fuel, or just what's recommended? Running good cetane numbers (42-45) is most beneficial in cold climates. I personally don't use cetane boost (Motorcraft PM22) until Oct. I get all the lubricity I need from Pa. diesel which is a 2% min. mandate.

 

Your lucky with the bio in PA. No such luck up here in NY.

 

Someone mentioned Opti-lube, they do not manufacture their products, their made by chemical Co.'s to Opti-Lube spec. This is a link to all fuel additive Co's in the US.

Alphabetical List of Registered Diesel Additives | US EPA

 

I have been using it for over 6 months now.

 

Doesn't appear to be recommended in the latest Version 7 Diesel Maintenance recommendations. I just took delivery on a new 2012 F350 6.7L and I was expressly instructed on delivery NOT to use any fuel additives but just to use diesel "straight from the tap." I have a copy of the the new v7 instructions but can't figure out how to post a .pdf.