I've started running Stanadyne Perf Formula and can get it locally for about $8/pt (16oz) incl tax, which treats 60gals of fuel. I've noticed that Power Service Diesel Fuel Supplement + Cetane boost runs about $6 or less/32oz that treats 100gal.

Based on 500gals of fuel, Stanadyne will run just over 2X as expensive as PS. Now I know that Stanadyne Perf Formula and Racor are the only GM approved diesel supplements and Racor doesn't provide the cold weather benefits of SPF. But over the long haul, considering I expect to own this truck for 10+yrs and well over a qtr. million miles, twice as much on or more seems ridiculous to me.

Now SPF does appear to beat PS and many others in the stats of cetain boost, pour point reduction, gel temp reduction, etc etc. I figure this will stir up some staunch opinions, so let's have them

Yup, it's more expensive and yup, it beats PS in every catagory and yes, I use it. I've used Stanadyne since it was new so I can't say whether it's better or not. Putting something into your truck to keep the fuel lines clean and boosting cetane should be a no brainer. To be honest with you I buy both at the same time and mix to make it last longer.

You may want to read the lubrication additive study.

http://www.dieselplace.com/forum/showthread.php?t=178848&highlight=diesel+additive

Been using it since new. So far so good!

power service is an emulsifier, gm specs for a demulsifier so dont use ps (power service) in a high pressure common rail diesel fuel injection system.

"power service is an emulsifier, gm specs for a demulsifier so dont use ps (power service) in a high pressure common rail diesel fuel injection system."

X2, emulsfying the water so it will pass thru the fuel filter to the injectors is NOT what you want for long term injector health.

Yup, it's more expensive and yup, it beats PS in every catagory and yes, I use it. I've used Stanadyne since it was new so I can't say whether it's better or not. Putting something into your truck to keep the fuel lines clean and boosting cetane should be a no brainer. To be honest with you I buy both at the same time and mix to make it last longer.
How does mixing and emulsifier (PS) and a demulsifier (SPF) work in theory?? Seems like the two are counteracting each other. PS is trying to suspend the water in the fuel mixture so that it can pass thru the filter while SPF is causing the water to form into droplets that can be easily separated from the fuel mixture at the filter and drained at the WIF sensor.

Also, seems like most emulsifiers use alcohol which is harder on components over the long haul of a diesel engine's life.

From reading these posts and doing a bit more research, it seems to me that SPF is the correct choice for me, thanks for all the info and input.

power service is an emulsifier, gm specs for a demulsifier so dont use ps (power service) in a high pressure common rail diesel fuel injection system.

Power Service is neither an emulsifier, nor a demulsifier. Here is an excerpt from one of their papers:

"A Demulsifier, an emulsifier and a water solubilizer are all water dispersants. All diesel fuel has water in it. The water that is in diesel fuel will not hurt or harm the motor, pumps or injectors. Low Sulfur diesel fuel usually has around 50 to 65ppm (parts per million) water in the fuel. When the water content of the fuel gets around 100ppm or higher, the more likely fuel filter icing will occur.

Demulsifiers will cause excess water to fall out of the fuel. This water will fall to the bottom of the fuel tank or fuel system and can cause corrosion, rust, reduced lubricity and in the winter months it can freeze in the fuel lines and prevent fuel flow. There are about a dozen demulsifiers or de-hazers on the market. None of them will work on all fuels. You have to test the fuel your are using against the various demulsifiers to see which one will work with that fuel. They are fuel specific and when an additive company says they use demulsifiers in their additives it is for advertisement purposes only. If you talk to any Chemist that knows anything about demulsifiers they will tell you the same thing.

An emulsifier will pull water up into the fuel as small droplets and often will cause the fuel to be cloudy. In the winter months when the temperature drops below freezing, these water droplets can freeze on the filter face of the water separator causing the flow of fuel to stop, even though the fuel is still liquid. It does not take much water to cause Fuel Filter Icing problems. Both Ford and Chevy have advised against the use of emulsifiers because of possible engine damage caused by water droplets in the fuel. These water droplets also reduce the lubricity of the fuel and hurt fuel pumps and can pit, scare and destroy injector tips, according to Ford and Chevy.

Diesel Kleen and Diesel Fuel Supplement do not contain demulsifiers, emulsifiers or alcohols."

power service is an emulsifier, gm specs for a demulsifier so dont use ps (power service) in a high pressure common rail diesel fuel injection system.
Better read again!

"power service is an emulsifier, gm specs for a demulsifier so dont use ps (power service) in a high pressure common rail diesel fuel injection system."

X2, emulsfying the water so it will pass thru the fuel filter to the injectors is NOT what you want for long term injector health.
Better read again!

Power Service is neither an emulsifier, nor a demulsifier. Here is an excerpt from one of their papers:

"A Demulsifier, an emulsifier and a water solubilizer are all water dispersants. All diesel fuel has water in it. The water that is in diesel fuel will not hurt or harm the motor, pumps or injectors. Low Sulfur diesel fuel usually has around 50 to 65ppm (parts per million) water in the fuel. When the water content of the fuel gets around 100ppm or higher, the more likely fuel filter icing will occur.

Demulsifiers will cause excess water to fall out of the fuel. This water will fall to the bottom of the fuel tank or fuel system and can cause corrosion, rust, reduced lubricity and in the winter months it can freeze in the fuel lines and prevent fuel flow. There are about a dozen demulsifiers or de-hazers on the market. None of them will work on all fuels. You have to test the fuel your are using against the various demulsifiers to see which one will work with that fuel. They are fuel specific and when an additive company says they use demulsifiers in their additives it is for advertisement purposes only. If you talk to any Chemist that knows anything about demulsifiers they will tell you the same thing.

An emulsifier will pull water up into the fuel as small droplets and often will cause the fuel to be cloudy. In the winter months when the temperature drops below freezing, these water droplets can freeze on the filter face of the water separator causing the flow of fuel to stop, even though the fuel is still liquid. It does not take much water to cause Fuel Filter Icing problems. Both Ford and Chevy have advised against the use of emulsifiers because of possible engine damage caused by water droplets in the fuel. These water droplets also reduce the lubricity of the fuel and hurt fuel pumps and can pit, scare and destroy injector tips, according to Ford and Chevy.

Diesel Kleen and Diesel Fuel Supplement do not contain demulsifiers, emulsifiers or alcohols."
I agree! Stanadyne and Power Service are very similar and both good products, with Stanadyne getting a slight edge in my book.

so what does power service do with the water?

John Deere used to recommend Stanadyne but a few years back they developed their own fuel conditioner because they were encountering injector pump problems related to Stanadyne use and low sulfer fuel. The new JD conditioner was specifically designed to improve performance over Stanadyne and provide lubricity especially when used with ULSD. Whats more it is cheaper than Stanadyne and it comes in winter and summer formulas.

I've never used stanadyne......But....I have used Power Service (silver and White) since I bought the truck. And have had great luck with it. In the summer I have noticed a loss of MPG if I DONT use it. So I keep the 1 gal jug in my truck and a couple more at home. Im know I use more than what they recommend but hey.......More is better right....lol

ParallelFish has sourced some excellent info.

The reality is that both Stanadyne and PS products are top notch. They produce reasonable results for the targeted markets they serve.

I would agree that Stanadyne might perform just the slight bit better, but that's really splitting hairs. Look over the lubricity study and you'll see some really good info!

I use PS products because they are readily available in my area, and they perform very well; I've had no issues since using it starting in 1986 when I had a diesel Tempo.

PS products are possilby a "better" value, because they give much more performance for the dollar. In my area, Stanadyne (if you can find it on the shelf) is almost 2x as much money, but it surely doesn't give 2x the icing protection, cloud point improvement, lubricity improvement, or anything else. For my money, the PS products rule based upon what I get for my money. I see maybe 10% or 20% more performance in the Stanadyne, depending upon criteria judged. But for nearly 100% more money? It's just not worth the extra coin to me.

However, I'm not disparaging the Stanadyne. It is a very good product line that serves the market well with a well-earned reputation.

ParallelFish has sourced some excellent info.

The reality is that both Stanadyne and PS products are top notch. They produce reasonable results for the targeted markets they serve.

I would agree that Stanadyne might perform just the slight bit better, but that's really splitting hairs. Look over the lubricity study and you'll see some really good info!

I use PS products because they are readily available in my area, and they perform very well; I've had no issues since using it starting in 1986 when I had a diesel Tempo.

PS products are possilby a "better" value, because they give much more performance for the dollar. In my area, Stanadyne (if you can find it on the shelf) is almost 2x as much money, but it surely doesn't give 2x the icing protection, cloud point improvement, lubricity improvement, or anything else. For my money, the PS products rule based upon what I get for my money. I see maybe 10% or 20% more performance in the Stanadyne, depending upon criteria judged. But for nearly 100% more money? It's just not worth the extra coin to me.

However, I'm not disparaging the Stanadyne. It is a very good product line that serves the market well with a well-earned reputation.
DNewton...:
From reading many of your posts over the last year or so, I know that you are a big fan of not using "non-GM" approved items that could lead to warranty issues, particularly on 100k Dmax or 100k powertrain warranty situations i.e. oil in Xfer case, performance mods, etc. Obviously this does not concern you with regard to using a "non-gm" approved fuel supplement. In your experience or knowledge of the subject, is this really a moot point and more of a GM endorsement of Stanadyne and Racor vs a situation where it really carries some weight as to why they only say to use those two?

Obviously, many people here use PS and have never had any issues, but I am curious as to why GM doesn't endorse PS if it has no ill effects and performance very similar to Stanadyne. I'd be interested in your viewpoint on this as I have learned much from your posts in the past, particularly with regard to oils and ATF's.

thx.

DNewton...:
From reading many of your posts over the last year or so, I know that you are a big fan of not using "non-GM" approved items that could lead to warranty issues, particularly on 100k Dmax or 100k powertrain warranty situations i.e. oil in Xfer case, performance mods, etc. Obviously this does not concern you with regard to using a "non-gm" approved fuel supplement. In your experience or knowledge of the subject, is this really a moot point and more of a GM endorsement of Stanadyne and Racor vs a situation where it really carries some weight as to why they only say to use those two?

Obviously, many people here use PS and have never had any issues, but I am curious as to why GM doesn't endorse PS if it has no ill effects and performance very similar to Stanadyne. I'd be interested in your viewpoint on this as I have learned much from your posts in the past, particularly with regard to oils and ATF's.

thx.Gm probably gets a kickback!
I have used Power Service(both summer and winter) since my truck was bought new.I have had no injector issues or fuel gelling issues in 90K miles.I think its good stuff and for the price,you cant beat it!:)