Is there a best or thay the same. Thank youhttp://www.dieselplace.com/forum/smileys/smiley1.gif

If you are driving a Duramax, GM only agrees with the use of Standyne and Racor additives, both non alcohol. Whatever you use must be alcohol free. I'm presently using Total Power (FPPF)and am getting ready to try Schaeffer's SOY SHIELD. Hope the Schaeffer's stuff works, I bought ten bottles of it.

I have been using Stanadynes performance formula. truck does run better when used as directed. I noticed when I mixed it a little heavy, MPG increased. I have switched over to Sunoco's "Premium Diesel" we will see if it is any better than Marathon diesel. Here in Ohio, BP diesel is not much better than water (at least in my truck which is a 2500HD LLY/Allision) so I was using Marathon and getting 18+ on the highway combined 16'ish

I use the PowerService from Walley World. It seems to be the only one I can get locally reliably

I've used Primrose 405 for about a year now and am very happy with it. Before that I used Redline 85Plus, which was also good, but Primrose seems to be better. These are not on GM's list. They are water emulsifiers and run counter to its philosophy, which is why I don't have to worry about rust particles reaching my injectors. 39,000 miles and still purring.

TC

I have to say that 405 worked better for me than standyne, it just
runs a lot smoother.

Where can you get 405?

Here is GM statement regaurding the use of fuel additives....
<H1>Diesel Engine Fuel</H1>



<H4>Notice</H4>


Diesel fuel or fuel additives not recommended in this manual could damage your fuel system and engine. Your warranty would not cover this damage. And:
<UL =BULLET>
<LI>Diesel fuel that has been mixed with engine oil or automatic transmission fluid could damage your engine and emission controls.
<LI>Aftermarket diesel fuel additives are not tested by General Motors. Some additives, particularly those which contain alcohol or water emulsifiers, may damage your fuel system. If you believe that unique circumstances call for a fuel additive to be used, consult your dealer for advice.
<LI>If you ever run out of diesel fuel, it can be difficult to restart your engine. To avoid all this, never let your tank get empty. </LI>[/list]

<H1>What Fuel to Use</H1>


In the United States, for best results use Number 2-D diesel fuel year-round (above and below freezing conditions) as oil companies blend Number 2-D fuel to address climate differences. Number 1-D diesel fuel may be used in very cold temperatures (when it stays below 0°F or -18°C); however, it will produce a power and fuel economy loss. Avoid the use of Number 1-D diesel fuel in warm or hot climates. It may result in stalling, poor starting when the engine is hot and may damage the fuel injection system.


At a minimum, the diesel fuel you use should meet specifications ASTM D975-02 (Grade Low Sulfur) in the United States. In addition, the Engine Manufacturers Association (EMA) has identified properties of an improved diesel fuel for better engine performance and durability. Diesel fuels corresponding to the EMA Recommended Guideline on Premium Diesel Fuel (FQP-1A) could provide better starting, less noise and better vehicle performance. If there are questions about the fuel you are using, contact your fuel supplier.


It is acceptable to use diesel fuel containing up to 5% biodiesel (B5), but the final blended fuel must meet the same specification, ASTM D975-02 (Grade Low Sulfur), as other fuels used in your vehicle, and the biodiesel used for making this fuel must meet the ASTM D6751-02 specification. Biodiesel is produced from vegetable oils or animal fat that have been chemically modified to reduce the possibility of damage to your fuel system and engine. Higher concentration (i.e., greater than B5) biodiesel-containing fuels or the use of unmodified bio-oils blended into diesel fuel at any concentration is not recommended and could damage your fuel system and engine. Such damage would not be covered by your warranty. If there are questions about the biodiesel-containing fuels you are using, contact your fuel supplier.


Diesel fuel may foam when you fill your tank. This can cause the automatic pump nozzle to shut off, even though your tank is not full. If this happens, just wait for the foaming to stop and then continue to fill your tank.



<H4>Caution</H4>


Heat coming from the engine may cause the fuel to expand and force the fuel out of your tank. If something ignites the fuel, a fire could start and people could be burned. To help avoid this, fill your fuel tank only until the automatic nozzle shuts off. Do not try to top it off.

<H1>Water in Fuel</H1>



<H4>Caution</H4>


Diesel fuel containing water is still flammable. You could be burned. If you ever try to drain water from your fuel, keep sparks, flames and smoking materials away from the mixture.






<H4>Notice</H4>


If there is water in your diesel fuel and the weather is warm or humid, fungus and bacteria can grow in the fuel. They can damage your fuel system. A diesel fuel biocide can be used to sterilize your fuel system. However, your fuel system may still need to be cleaned. Your dealer can advise you of the appropriate solution.


If your fuel tank needs to be purged to remove water, see your dealer or a qualified technician. Improper purging can damage your fuel system.





Sometimes, water can be pumped into your fuel tank along with your diesel fuel. This can happen if a service station doesn't regularly inspect and clean its fuel tanks, or if it gets contaminated fuel from its suppliers.


If this happens, a WATER IN FUEL message will appear on the Driver Information Center (DIC). If it does, the water must be drained. Your dealer can show you how to do this.

A customer from of ours got a fuel tank of water,slime and diesel.


the injector pump died, a few injector tips cracked, and the bill was $7493.00. we replaced all 8 injectors, the injector pump dropped fuel tank, flushed entire fuel system, and replaced filter.


had the customer NOT had his fuel receipt, he would have had to pay for this out of his pocket...Warranty WILL NOT COVER contaminated fuel....


allway get a receipt...........


there is a tab in the pressure regulator on the pump that will show signs of water contamination....just so ya know.

<H1>Information on Diesel Fuel Additives #03-06-04-017 - (Mar 13, 2003)</H1>Information on Diesel Fuel Additives


1994-1996 Chevrolet Chevy G-Van, Sport Van


1994-1999 Chevrolet Suburban, Tahoe, P Chassis


1994-2000 Chevrolet C/K 1500, 2500 Models


1994-2002 Chevrolet C/K 3500 Model


1996-2002 Chevrolet Express


2001-2003 Chevrolet Silverado


1997-2003 Chevrolet F Model (T Series) Medium Duty Tilt Cab


1999-2003 Chevrolet W Series Medium Duty Tilt Cab


2000-2003 Chevrolet WT5500 Model Medium Duty Tilt Cab


2003 Chevrolet 4500/5500 Series Medium Duty Trucks


1994-1996 GMC G-Van (Rally Wagon, Vandura)


1994-1997 GMC Yukon


1994-1999 GMC Suburban, P Chassis


1994-2000 GMC C/K 1500, 2500 Models


1994-2002 GMC C/K 3500 Model


1996-2002 GMC Savana


2001-2003 GMC Sierra


1997-2003 GMC F Model (T Series) Medium Duty Tilt Cab


1999-2003 GMC W Series Medium Duty Tilt Cab


2000-2003 GMC WT5500 Model Medium Duty Tilt Cab


2003 GMC 4500/5500 Series Medium Duty Trucks


1997-2003 Isuzu FSR, FTR, FVR Model Medium Duty Tilt Cabs


1999-2003 Isuzu NPR, NQR Model Medium Duty Tilt Cabs


2000-2003 Isuzu FRR Model Medium Duty Tilt Cab


with 6.5L, 6.6L, 7.2L or 7.8L Diesel Engine (VINs F, P, S, Y, 1, B, 3 - RPOs L65, L49, L56, L57, LB7, LC8, LG4)


The use of diesel fuel additives is not required or recommended for the 6.5L diesel or the 6.6L Duramax® Diesel engine under normal conditions. The filtering system is designed to block water and contaminants without the use of additives. However, some customers may desire to use fuel additives to improve the characteristics of available diesel fuels.<A name=ss1-1265022><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1265022&amp;pubid=297&amp;evc=sm#ss1-1265022" target="_blank">
<H5>Water Emulsifiers and Demulsifiers</A></H5>


If the customer desires to use a fuel additive, care must be taken in its selection. There are two common methods that fuel additives use to cope with water in the fuel. One method is through demulsification of water in the fuel. This method causes water particles to combine together to form larger particles, which drop out of suspension. This allows the fuel filter/water separator to separate the water from the fuel as it is designed to. The other method of coping with water in the fuel is through emulsification. This method, often using alcohol as the emulsifier, keeps water particles suspended in the fuel. Emulsification of water in the fuel can allow water to get past the fuel filter/water separator, in most cases causing damage to the fuel system.


Only alcohol free water demulsifiers should be used in General Motors diesel engines. Both *Racor® and *Stanadyne® diesel fuel additives are alcohol free and utilize water demulsifiers to cope with water in the fuel. Other brands may be available in different areas; be sure that they clearly state that they are alcohol free demulsifiers before use.


*We believe these sources and their products to be reliable. General Motors does not endorse, indicate any preference for or assume any responsibility for the products from these firms or for any such items which may be available from other sources.<A name=ss2-1265022><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1265022&amp;pubid=297&amp;evc=sm#ss2-1265022" target="_blank">
<H5>COMMON DIESEL FUEL CONCERNS</A></H5>Fuel Waxing/Icing


Fuel distributors blend #1 and #2 diesel fuels for seasonal requirements in a particular region. No other blending of fuels is recommended. However, a customer may desire to use a winter fuel additive to prevent fuel waxing or icing during extreme cold snaps. If a winter fuel additive is to be used, it should not contain alcohol or other water emulsifiers that may compromise the water removal effectiveness of the fuel filtering system.Bacteria and Fungi Growth


Bacteria and fungi growth can occur in di

As quoted by Gm manuals.


Diesel fuels corresponding to the EMA Recommended Guideline on Premium Diesel Fuel (FQP-1A) could provide better starting, less noise and better vehicle performance.


If there is water in your diesel fuel and the weather is warm or humid, fungus and bacteria can grow in the fuel. They can damage your fuel system


A customer from of ours got a fuel tank of water,slime and diesel.


However, some customers may desire to use fuel additives to improve the characteristics of available diesel fuels.


Bacteria and Fungi Growth


Bacteria and fungi growth can occur in diesel fuel when there is water present, especially during warmer weather. The best prevention against bacteria and fungi growth is to use clean fuel that is free of water.


A fuel additive designed to increase lubricity is not a fix for poor quality or contaminated fuel, but some customers may desire to use a lubricity additive to aid in the longevity of their fuel system components.





However, some customers may desire to use fuel additives to improve the characteristics of available diesel fuels.





Gm makes a great case for using Premium, fuel improvers, and fuel additives.Edited by: salesrep

Hey Master,


"had the customer NOT had his fuel receipt, he would have had to pay for this out of his pocket...Warranty WILL NOT COVER contaminated fuel...."


So did the warrenty cover this or the fuel supplier?

The gas stations insurance company paid for the repair.

I used Power Service for the first time last week. My LLY seems to idle smoother and have better acceleration. Unfortunately I went a little heavier on the mix than intended so I boosted cetane numbers up to around 4.


I always try to buy diesel fuel at truck stops. Yeah they are messy as hell, but they tend to have the best prices and receive fresh fuel on a regular basis. Plus their pumps are fast! JJ http://www.dieselplace.com/forum/smileys/smiley4.gif