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Discussion Starter #1
I was about to post this message in another post about MPG but decided to create another thread. I've got less than 12k miles and had been averaging 28-29 mpg. However, since the winter (and the snow we've had here in NY), I've been running with the selector on "auto" and MPGs have dropped to 25-26 mpg. I tried Diesel Extreme Fuel Additive and my MPG is back up to the 28-29 mg.

I was wondering if anyone had any experience with Diesel Extreme and any other additive. Are any out there worthwhile?
 

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Winter blend diesel usually drops your mpg's. I believe it is because the mix Diesel #1 in with #2 to keep it from gelling. Hopefully. Sacrafice some mpg's for fuel that won't gel I guess.
 

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Keep in mind that auto is not the same as all-wheel-drive, it’s not even four-wheel-drive under normal operation. If anything, its “stand-by 4wd”

In auto you are still propelled by rear wheel drive (2wd) but the truck is prepared to send some power to the front axle temporarily, as needed.

The extra drag you feel in auto is the front axle. It’s engaged in this mode even when not receiving power, so you’re spinning the driveshaft and r&p with the tires as you drive. Normally it’s disengaged and the driveshaft doesn’t spin

More drag, more fuel.
 

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Discussion Starter #6
Keep in mind that auto is not the same as all-wheel-drive, it’s not even four-wheel-drive under normal operation. If anything, its “stand-by 4wd”

In auto you are still propelled by rear wheel drive (2wd) but the truck is prepared to send some power to the front axle temporarily, as needed.

The extra drag you feel in auto is the front axle. It’s engaged in this mode even when not receiving power, so you’re spinning the driveshaft and r&p with the tires as you drive. Normally it’s disengaged and the driveshaft doesn’t spin

More drag, more fuel.
Exactly but I take it out of auto into 2wd whenever the roads are clear. So those additives don't to much? I'm going to stop watching Truck U.
 

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I was about to post this message in another post about MPG but decided to create another thread. I've got less than 12k miles and had been averaging 28-29 mpg. However, since the winter (and the snow we've had here in NY), I've been running with the selector on "auto" and MPGs have dropped to 25-26 mpg. I tried Diesel Extreme Fuel Additive and my MPG is back up to the 28-29 mg.

I was wondering if anyone had any experience with Diesel Extreme and any other additive. Are any out there worthwhile?
 

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I've been using variations of Howes Lubricator "Diesel Treat" Diesel Conditioner & Anti-Gel over many years within five different Diesel engines. In various improving incarnations, its been dependably about since the 1920s. As the paraffin molecules within diesel fuel can cluster and freeze when exposed to extremely cold temps, you want an effective anti-gel such as Howes, or any other similar non-emulsifier product of your choice capable of maintaining diesel fuel pour-points down to a minimum temp of -20 below zero. Personally, throughout my years using this product, I've never been left stranded due to extreme cold weather temperature-drop pour points effects upon diesel fuel, nor have I ever experienced any cold-weather related fuel system delivery, frozen fuel filters, or engine performance issues. As a non-emulsifier of H20 within diesel fuel, it's Chevrolet warranty friendly. Therefore, in my opinion, I've found Howes to be a safe, dependable Ultra-Low Sulfur Fuel approved additive. It's what I use...Best Wishes, TMc
 

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Discussion Starter #11
Second fill up and still maintained the 28 mpg. Without using auto, must have been the reason for the drop.
 

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Stanadyne performance formula (blue label) is the only diesel additive which carries OEM approvals that I currently know of.
CleverUserName: This is a GM Service Bulletin release addressing use of fuel additives; suggested as not necessary... but "However some customers may desire to use fuel additives to improve the characteristics of available diesels fuels..." . Worth a read. TMc

Copyright 2016 General Motors LLC. All Rights Reserved.

Service Bulletin

File in Section: 06 - Engine

Bulletin No.: 03-06-04-017I

Date: August, 2016

INFORMATION

Subject: Information on Diesel Fuel Additives

Models: 2014-2015 Chevrolet Cruze (RPO LUZ)

2016 Chevrolet Colorado

2016-2017 Chevrolet Low Cab Forward 3500HD, 4500HD/XD, 5500HD/XD Medium Duty

2016 GMC Canyon

2016 and Prior GM Chevrolet and GMC Light Duty and Medium Duty Trucks

Attention: This Bulletin also applies to any of the above models that may be Export from North

America vehicles.

This Bulletin has been revised to add the 2016-2017 Low Cab Forward Medium Duty trucks,

remove the Notice statement and add information on Diesel Fuel Conditioner/fuel system

treatment products. Please discard Corporate Bulletin Number 03-06-04-017H.

Diesel Fuel Additives Are Not Required

or Recommended

The use of diesel fuel additives are not required or

recommended for the Cruze 2.0L diesel engine 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.

Refer to the Parts Information below.

Water Emulsifiers and Demulsifiers

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 do.

• 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

other components of the fuel system.

Common Diesel Fuel Concerns

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 must not contain

any metal based additives, alcohol or other water

emulsifiers that may compromise the water removal

effectiveness of the fuel filtering system.

*In Canada, Diesel fuel blend #1 is categorized as type

A (Winter) and blend #2 is categorized as type B

(Summer)

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. There

are diesel fuel biocides available which are designed to

kill bacterial growth in the fuel system. However, the

dead bacteria can still cause blockages throughout the

fuel system. If bacterial growth is found in the fuel

system, the proper method of removal is to flush the

fuel system using the appropriate Service Manual

procedures, replace the fuel filter element and refilling

the tank with clean diesel fuel. If a customer desires to

use a biocide after flushing the fuel system, it must not

contain any metal based additives, alcohol or other

water emulsifiers.

Page 2 August, 2016 Bulletin No.: 03-06-04-017I

Low Cetane Number

The cetane number is one indicator of a diesel fuel's

ability to ignite. There are many indicators of overall

fuel quality such as cleanliness, specific gravity,

volatility, viscosity, detergency, corrosion inhibiting

abilities, and lubricity. Increasing the cetane number

alone is not a fix for poor quality fuel. Additionally,

increasing the cetane number beyond the engine's

requirements will not increase performance. However,

the cetane number of diesel fuel is not always

consistent and some customers may desire to use a

cetane improver to ensure full performance of their

engine. If such an additive is to be used, it must not

contain any metal based additives, alcohol or other

water emulsifiers.

Poor Lubricity

The 2.0L diesel and the 6.6L Duramax® Diesel engines

are designed to operate on today's low sulfur fuel

without the use of additives. 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. If such an additive is to be

used, it must not contain any metal based additives,

alcohol or other water emulsifiers.

Fuel Stability

Fuel Stability and degradation may be a concern for

diesel fuels, especially for diesel fuel containing

biodiesel. Use of aftermarket stability additives to

improve quality of a degraded fuel is not a fix and use of

such aftermarket stability additives by customers is

discouraged due to concerns of proper mixing and fuel

compatibility. However some customers may desire to

use a stability additive to increase the shelf life of their

fuel. If such an additive is to be used, it must not

contain any metal based additives, alcohol or other

water emulsifiers.

Fuel Source Issue

If a vehicle is properly maintained but has fuel

contamination issues, consider obtaining fuel from a

different source. Purchasing fuel from a high volume

fuel retailer increases the chance that the fuel is fresh

and of good quality.

Parts information

GM ACDelco Diesel Fuel Conditioner

GM Diesel Fuel Conditioner®, P/N 88861698 (in

Canada, P/N 88861699) is alcohol free and metal free

additive. It is multifunctional additive and provides

benefits of cleaning engine deposits, improved lubricity,

improved cold temperature fuel flow, reduced fuel filter

plugging, corrosion protection, enhanced fuel stability

and cetane boost.

GM ACDelco Fuel System Treatment Plus

If the customer experiences concerns related to fuel

injector deposits, then it is allowed to use FUEL

SYSTEM TREATMENT PLUS® – DIESEL, P/N

88865597 (in Canada, P/N 88865600) based on

recommendation from the dealership technician. This is

a highly concentrated product and should be used as

per defined guidelines.

Duramax® is a Registered Trademark of General

Motors LLC (In the United States)

Duramax™ is a Trademark of General Motors LLC

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these

technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper

service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a

job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your

vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the

information.

WE SUPPORT VOLUNTARY

TECHNICIAN

CERTIFICATION
 

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Standayne carries OEM approvals from multiple manufacturers, not just GM.

http://stanadyneadditives.com/wp-content/uploads/2014/10/MB-2046-OEM-Approvals-June-2000-2.pdf

I think GM is now recommending their own additive, (ACDelco GM Diesel Fuel Conditioner®, P/N 88861698) to promote their own product and limit customer tampering. It is entirely possible that the ACDelco fuel additive is re-packaged Stanadyne PF. VW was doing this and had a VW part #.

Most diesel fuel additives, including Stanadyne PF have strong solvents which can thin engine oil if you have excessive fuel dilution, causing premature engine wear. They should all be used with caution and do not exceed the recommended dosage. Use oil analysis to test viscosity and %FD to verify.

CleverUserName: This is a GM Service Bulletin release addressing use of fuel additives; suggested as not necessary... but "However some customers may desire to use fuel additives to improve the characteristics of available diesels fuels..." . Worth a read. TMc

Copyright 2016 General Motors LLC. All Rights Reserved.

Service Bulletin

File in Section: 06 - Engine

Bulletin No.: 03-06-04-017I

Date: August, 2016

INFORMATION

Subject: Information on Diesel Fuel Additives

Models: 2014-2015 Chevrolet Cruze (RPO LUZ)

2016 Chevrolet Colorado

2016-2017 Chevrolet Low Cab Forward 3500HD, 4500HD/XD, 5500HD/XD Medium Duty

2016 GMC Canyon

2016 and Prior GM Chevrolet and GMC Light Duty and Medium Duty Trucks

Attention: This Bulletin also applies to any of the above models that may be Export from North

America vehicles.

This Bulletin has been revised to add the 2016-2017 Low Cab Forward Medium Duty trucks,

remove the Notice statement and add information on Diesel Fuel Conditioner/fuel system

treatment products. Please discard Corporate Bulletin Number 03-06-04-017H.

Diesel Fuel Additives Are Not Required

or Recommended

The use of diesel fuel additives are not required or

recommended for the Cruze 2.0L diesel engine 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.

Refer to the Parts Information below.

Water Emulsifiers and Demulsifiers

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 do.

• 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

other components of the fuel system.

Common Diesel Fuel Concerns

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 must not contain

any metal based additives, alcohol or other water

emulsifiers that may compromise the water removal

effectiveness of the fuel filtering system.

*In Canada, Diesel fuel blend #1 is categorized as type

A (Winter) and blend #2 is categorized as type B

(Summer)

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. There

are diesel fuel biocides available which are designed to

kill bacterial growth in the fuel system. However, the

dead bacteria can still cause blockages throughout the

fuel system. If bacterial growth is found in the fuel

system, the proper method of removal is to flush the

fuel system using the appropriate Service Manual

procedures, replace the fuel filter element and refilling

the tank with clean diesel fuel. If a customer desires to

use a biocide after flushing the fuel system, it must not

contain any metal based additives, alcohol or other

water emulsifiers.

Page 2 August, 2016 Bulletin No.: 03-06-04-017I

Low Cetane Number

The cetane number is one indicator of a diesel fuel's

ability to ignite. There are many indicators of overall

fuel quality such as cleanliness, specific gravity,

volatility, viscosity, detergency, corrosion inhibiting

abilities, and lubricity. Increasing the cetane number

alone is not a fix for poor quality fuel. Additionally,

increasing the cetane number beyond the engine's

requirements will not increase performance. However,

the cetane number of diesel fuel is not always

consistent and some customers may desire to use a

cetane improver to ensure full performance of their

engine. If such an additive is to be used, it must not

contain any metal based additives, alcohol or other

water emulsifiers.

Poor Lubricity

The 2.0L diesel and the 6.6L Duramax® Diesel engines

are designed to operate on today's low sulfur fuel

without the use of additives. 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. If such an additive is to be

used, it must not contain any metal based additives,

alcohol or other water emulsifiers.

Fuel Stability

Fuel Stability and degradation may be a concern for

diesel fuels, especially for diesel fuel containing

biodiesel. Use of aftermarket stability additives to

improve quality of a degraded fuel is not a fix and use of

such aftermarket stability additives by customers is

discouraged due to concerns of proper mixing and fuel

compatibility. However some customers may desire to

use a stability additive to increase the shelf life of their

fuel. If such an additive is to be used, it must not

contain any metal based additives, alcohol or other

water emulsifiers.

Fuel Source Issue

If a vehicle is properly maintained but has fuel

contamination issues, consider obtaining fuel from a

different source. Purchasing fuel from a high volume

fuel retailer increases the chance that the fuel is fresh

and of good quality.

Parts information

GM ACDelco Diesel Fuel Conditioner

GM Diesel Fuel Conditioner®, P/N 88861698 (in

Canada, P/N 88861699) is alcohol free and metal free

additive. It is multifunctional additive and provides

benefits of cleaning engine deposits, improved lubricity,

improved cold temperature fuel flow, reduced fuel filter

plugging, corrosion protection, enhanced fuel stability

and cetane boost.

GM ACDelco Fuel System Treatment Plus

If the customer experiences concerns related to fuel

injector deposits, then it is allowed to use FUEL

SYSTEM TREATMENT PLUS® – DIESEL, P/N

88865597 (in Canada, P/N 88865600) based on

recommendation from the dealership technician. This is

a highly concentrated product and should be used as

per defined guidelines.

Duramax® is a Registered Trademark of General

Motors LLC (In the United States)

Duramax™ is a Trademark of General Motors LLC

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these

technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper

service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a

job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your

vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the

information.

WE SUPPORT VOLUNTARY

TECHNICIAN

CERTIFICATION
 

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I used Power service diesel supplement. It stopped my truck from rough startup in the freezing morning. It is neither a demulsifier nor a emulsifier. It’s just for winterizing and antigel. And it stated right on the bottle that it will not void warranty, which means if GM void my warranty, Power Service will step in to honor their claim.

Just my 2cents
 
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