(1) Intake valve: 10,000 miles with TOP TIER Detergent Gasoline
(2) Intake valve: 10,000 miles with Legal Minimum additive
(1) Intake valve: 10,000 miles with TOP TIER Detergent Gasoline
(2) Intake valve: 10,000 miles with Legal Minimum additive
Subject: Info - TOP TIER Detergent Gasoline (Deposits, Fuel Economy, No Start, Power, Performance, Stall Concerns) - U.S. Only #04-06-04-047G - (11/28/2006)
Models: 2007 and Prior GM Passenger Cars and Trucks (including Saturn) (U.S. Only)
2003-2007 HUMMER H2 (U.S. Only)
2006-2007 HUMMER H3 (U.S. Only)
2005-2007 Saab 9-7X (U.S. Only)
This bulletin is being revised to add additional sources to the Top Tier Fuel Retailers list. Please discard Corporate Bulletin Number 04-06-04-047F (Section 06 - Engine/Propulsion System). In Canada, refer to Corporate Bulletin Number 05-06-04-022C
A new class of fuel called TOP TIER Detergent Gasoline is appearing at retail stations of some fuel marketers. This gasoline meets detergency standards developed by four automotive companies. All vehicles will benefit from using TOP TIER Detergent Gasoline over gasoline containing the "Lowest Additive Concentration" set by the EPA. Those vehicles that have experienced deposit related concerns may especially benefit from the use of TOP TIER Detergent Gasoline.
Gasoline Brands That Currently Meet TOP TIER Detergent Gasoline Standards
As of November 15, 2006, all grades of the following gasoline brands meet the TOP TIER Detergent Gasoline Standards:
Entec Stations located in the greater Montgomery, Alabama area.
MFA Oil Company located throughout Missouri.
Kwik Trip, Inc. in Minnesota and Wisconsin andKwik Star convenience stores in Iowa.
The Somerset Refinery, Inc. at Somerset Oil stations in Kentucky.
Tri-Par Oil Company
What is TOP TIER Detergent Gasoline?
TOP TIER Detergent Gasoline is a new class of gasoline with enhanced detergency. It meets new, voluntary deposit control standards developed by four automotive companies that exceed the detergent requirements imposed by the EPA.
Where Can TOP TIER Detergent Gasoline Be Purchased?
The TOP TIER program began on May 3, 2004. Some fuel marketers have already joined and have introduced TOP TIER Detergent Gasoline. This is a voluntary program and not all fuel marketers will offer this product. Once fuel marketers make public announcements, they will appear on a list of brands that meet the TOP TIER standards.
Where Can I find the Latest Information on TOP TIER Fuel and Retailers?
On the web, please visit www.toptiergas.com for additional information and updated retailer lists.
Who developed TOP TIER Detergent Gasoline standards?
TOP TIER Detergent Gasoline standards were developed by four automotive companies: BMW, General Motors, Honda and Toyota.
Why was TOP TIER Detergent Gasoline developed?
TOP TIER Detergent Gasoline was developed to increase the level of detergent additive in gasoline. The EPA requires that all gasoline sold in the U.S. contain a detergent additive. However, the requirement is minimal and in many cases, is not sufficient to keep engines clean. In order to meet TOP TIER Detergent Gasoline standards, a higher level of detergent is needed than what is required by the EPA. Also, TOP TIER was developed to give fuel marketers the opportunity to differentiate their product.
Why did the four automotive companies join together to develop TOP TIER?
All four corporations recognized the benefits to both the vehicle and the consumer. Also, joining together emphasized that low detergency is an issue of concern to several automotive companies.
What are the benefits of TOP TIER Detergent Gasoline?
TOP TIER Detergent Gasoline will help keep engines cleaner than gasoline containing the "Lowest Additive Concentration" set by the EPA. Clean engines help provide optimal fuel economy and performance and reduced emissions. Also, use of TOP TIER Detergent Gasoline will help reduce deposit related concerns.
TOP TIER Detergent Gasoline Retailers
Gasoline retailers must meet the high TOP TIER standards with all grades of gasoline to be approved by the automakers as providing TOP TIER Detergent Gasoline.
In addition, all gasoline outlets carrying the brand of the approved retailer must meet the TOP TIER standards.
Additional gasoline retailers are added to the TOP TIER list as they meet the standards. The retailers known to be on the TOP TIER list are shown below.
TOP TIER Gasoline Retailers:
MFA Oil Company
Kwik Trip/Kwik Star
The Somerset Refinery, Inc.
Tri-Par Oil Company
Deposit Control Standards
The standards developed by the four automobile manufacturers (BMW, General Motors, Honda, and Toyota) for TOP TIER Detergent Gasoline are described below. This technical document describes the deposit control performance of unleaded gasoline at the retail level that minimizes deposits on fuel injectors, intake valves, and combustion chambers. These standards comprise the requirements for TOP TIER Detergent Gasoline.
1.1 Retail Gasoline Performance Standards. The deposit control performance of unleaded gasoline conforming to section 1 of this document shall be met at the retail level in all grades of gasoline sold by a fuel company in all marketing areas of a selected nation. In addition, conformance to the standards shall mean gasoline sold in the selected nation shall not contain metallic additives, including methylcyclopentadienyl manganese tricarbonyl (MMT).
1.2 Deposit Control Additive Requirements. The deposit control additive used to meet the performance Standards described in 1.3 shall meet the substantially similar definition under Section 211(f) of the Clean Air Act. Also, the additive shall be certified to have met the minimum deposit control requirements established by the U.S. Environmental Protection Agency (EPA) in 40 CFR Part 80. Lastly, the additive shall be registered with the EPA in accordance with 40 CFR Part 79.
1.3 Deposit Control Initial Performance Standards. Initial deposit control performance shall be demonstrated using the tests shown below.
1.3.1 Intake Valve Keep Clean Initial Performance Standard.
184.108.40.206 Test Method. Intake valve deposit (IVD) keep clean performance shall be demonstrated using ASTM D 6201, Standard Test Method for Dynamometer Evaluation of Unleaded Spark-lgnition Engine Fuel for Intake Valve Deposit Formation. Tests demonstrating base fuel minimum deposit level (220.127.116.11) and additive performance (18.104.22.168) shall be conducted using the same engine block and cylinder head. All results shall be derived from operationally valid tests in accordance with the test validation criteria of ASTM D 6201. IVD results shall be reported for individual valves and as an average of all valves.
22.214.171.124 Base Fuel. The base fuel shall conform to ASTM D 4814 and shall contain commercial fuel grade ethanol conforming to ASTM D 4806. All gasoline blend stocks used to formulate the base fuel shall be representative of normal U.S. refinery operations and shall be derived from conversion units downstream of distillation. Butanes and pentanes are allowed for vapor pressure adjustment. The use of chemical streams is prohibited. The base fuel shall have the following specific properties after the addition of ethanol:
126.96.36.199 Demonstration of Performance. The base fuel from 188.8.131.52 shall contain enough deposit control additive such the IVD is no more than 50 mg averaged over all intake valves. Results for individual valves and an average shall be reported. The unwashed gum level of the fuel containing deposit control additive shall be determined according to ASTM D 381 and reported.
- Contain enough denatured ethanol such that the actual ethanol content is no less than 8.0 and no more than 10.0 volume percent.
- Contain no less than 8 volume percent olefins. At least 75% of the olefins shall be derived from FCC gasoline as defined by CARB (advisory letter, April 19, 2001).
- Contain no less than 28 volume percent aromatics.
- Contain no less than 48 mg/kg sulfur. At least 60% of the sulfur shall be derived from FCC blend stock.
- Produce a 90% evaporation distillation temperature no less than 290°F.
- Produce IVD no less than 500 mg averaged over all intake valves.
1.3.2 Combustion Chamber Deposit Initial Performance Standard.
184.108.40.206 Test Method. Combustion chamber deposits (CCD) shall be collected and weighed along with IVD using ASTM D 6201, Standard Test Method for Dynamometer Evaluation of Unleaded Spark-Ignition Engine Fuel for Intake Valve Deposit Formation. ASTM D 6201 does not contain a procedure for collecting and measuring CCD. Adapting a scrape and weigh procedure developed by CARB is recommended (see referenced test method dated March 12, 1999). Results for individual cylinders and an average shall be reported.
220.127.116.11 Base Fuel. Combustion chamber deposits shall be measured for the base fuel from 18.104.22.168.
22.214.171.124 Demonstration of Performance. The base fuel from 126.96.36.199 treated with additive at the concentration meeting the standard found in 188.8.131.52 shall not result in more than 140% of the average CCD weight for the base fuel without additive.
1.3.3 Fuel Injector Fouling Initial Performance Standard.
184.108.40.206 Test Method. Fuel injector fouling shall be measured using the TOP TIER fuel injector fouling vehicle test available from GM. GM will run the test on a first-come-first-served basis and shall make the method available to those who wish to run the test on their own.
220.127.116.11 Base Fuel. Two options for base fuel are available:
18.104.22.168.1 Option 1. A full boiling range hydrocarbon gasoline or gasoline blending component, without oxygenates and without deposit control additives, that results in at least five inoperative injectors when tested by the method in 22.214.171.124.
126.96.36.199.2 Option 2. Federal emissions test gasoline specified in DFR 86.113-04, into which 4-methylbenzenethiol (WARNING: Flammable solid; irritant) has been blended at a concentration of 56 mg/L. The blended fuel must result in at least four inoperative injectors when tested by the method in 188.8.131.52. the Federal emissions gasoline, without deposit control additives, available from Haltermann Products (1201 South Sheldon Road, Channelview, TX 77530; tel.: 800-969-2542) has been found to be satisfactory.
184.108.40.206 Demonstration of Performance. A demonstration of injector fouling shall be done first. At least five out of six injectors (with Option 1) or at least four out of six injectors (with Option 2) shall be inoperative for the test to be valid. A demonstration of additive performance shall be done after the fouling tendency demonstration; no other test shall be conducted on the vehicle in the interim. A demonstration of additive performance shall be conducted using the same vehicle (including the fuel drain and flush procedures and installing new injectors) with the same batch of base fuel, but now containing the same amount of deposit control additive as in 220.127.116.11. A pass is defined as no more than one inoperative injector.
1.3.4 Determination of Deposit Control Additive Performance Concentration.
18.104.22.168 Methodology. The concentration of deposit control additive needed to meet the standards in 22.214.171.124 and 126.96.36.199 should be equivalent. However, if the concentration of deposit control additive in 188.8.131.52 is grater than in 184.108.40.206m the higher value shall be regarded as meeting both standards. Also, if the difference between the two concentrations is grater than 15%, 220.127.116.11 shall be repeated using the higher concentration.
1.3.5 Intake Valve Sticking Initial Performance Standard.
18.104.22.168 Test Method. Intake valve sticking tendency shall be determined using either the 1.9 L Volkswagen engine (Wasserboxer according to CEC F-16-T-96) or the 5.0 L 1990-95 General Motors V-8 engine (SWRI IVS test). Two options are available for demonstrating intake valve sticking tendency.
22.214.171.124 Option 1. The valve-sticking tendency of the test fuel by itself will not have to be demonstrated prior to testing the candidate additive. The following shall be required of all tests:
126.96.36.199.1 Demonstration of Performance. A pass shall result in no stuck valves during any of the three cold starts. A stuck valve is defined as one in which the cylinder pressure is less than 80% of the normal average cylinder compression pressure.
- Test fuel shall be either the same as in 188.8.131.52 or CEC valve sticking reference fuel.
- Concentration of deposit control additive in the test fuel shall be at least twice the amount determined in 184.108.40.206.
- Test temperature shall be -20°C.
- Three 16-hr cold soak cycles, each followed by a compression pressure check, shall constitute a complete test.
220.127.116.11 Option 2. The valve-sticking tendency of the test fuel together with an additive known to cause valve sticking shall be demonstrated prior to testing the candidate additive. The following shall be required of all tests:
18.104.22.168.1 Demonstration of Performance. A pass shall result in no stuck valves during the cold start. A stuck valve is defined as one in which cylinder compression is less than 80% of the normal average cylinder compression pressure.
- Test fuel shall be either the same as in 22.214.171.124 or CEC valve sticking test reference fuel.
- An additive known to cause valve sticking shall be selected, and, when blended into test fuel, shall demonstrate valve sticking tendency as follows: (a) for the Volkswagen engine, at least two valves shall be stuck; (b) for the GM engine, at least three valves shall be stuck.
- Test demonstrating performance of the candidate additive shall be conducted at a concentration that is at least three times the amount determined in 126.96.36.199.
- Test temperature shall be -20°C.
- One 16-hr cold soak cycle followed by a compression pressure check shall constitute a complete test.
:highfive: AJ......Look up my post on TECHRON, Chevron's additive which is now being used in (depending on the supplier) Shell and Texaco gasolines as well as those others you list. That is the additive which puts these fuels into the GM "Top Tier" fuel category. Look for the logo on the pump or sign on top of the pump. A bit of surfing will find several warehouses which sell case lots of TECHRON in 20 oz. containers at considerably less than your local dealer. It really takes only a treatment or two, then run a recommended fuel. Slugging the stuff in every tank is not recommended. I have done the foregoing and honestly believe it works, and I still have 8 containers left of 12, UPS'd in 2,000 miles ago.
At the local refinery they produce gasoline for all the local retailers in different octane ratings and it all comes out the same hoses as they load the trucks. The additives that make one brand different from another are loaded in the tanker as it's filled. Gasoline moves across the U.S. as a commodity in refined products pipelines. The same grade from different refineries is all mixed together. Once again the additives are combined with the base stocks as the trucks are loaded at the terminal.
Are those valves your personal pictures or from the Top Tier site (which would make them somewhat self serving)?
The pictures are from a TSB. YES A TSB. Most of the TSB's and some parts of the service manuals have real pictures. In color. WOW.
It is a BIG deal.
I love them. It make it easier to work on the car.
I lived in Washington state until the end of 1992. I lived near the Canadian border near Blaine until 79. My grandparents live in that area near Cherry Point. Cherry Point is west of Ferndale and has 2 refineries. When I was young they were ARCO and Mobil. The ARCO refinery is a ConocoPhillips refinery now. The Mobil is a BP.
The BP refinery uses a tier type refinery and back about 4 years ago I was told that Top Tier would be refined in this fashion. .
Minimal EPA standards
1. minimum refining the crude oil. (still thick sludge)
2. load it up with additives to meet octane requirements and EPA standards
Top Tier standards.
1. refine gas in a Tower or Tier and pull out the good fuel (like they used to do)
2. "Lowest Additive Concentration" set by the EPA[/LIST].
I may be wrong on this information. I was given it before Top Tier was out.
I wish I had a picture of the ConocoPhillips refinery. It had and may still not have a Tower and is the Largest refinery on the west coast.
This is the BP refinery I think. The BP refinery is #4 on the west coast.
In not so many words, "Top Tier" gas is the exact equivalent of "Top Rail" at your favorite gin mill : The Good Stuff.
I use Shell top tier gas always!
1. Toyota running on cheap discount gas.
2. My oil burning Cadillac (I know they all do) on Shell top Tier gas.
There is too much oil being burnt in Cadillacs for any top tier gas to take care of. In my opinion.
If you do a little research on rings, internal engine drag, gas ported pistons, low tension rings, and how to keep low tension rings from sticking in the ring lands. Then you may under stand why some oil consumption is OK. You then would under stand why WOT accelerations are important. This is because Northstars do not have gas ported piston.
:highfive: Good info, AJ, and someone's earlier statement that "all cadillacs burn oil..." is patently false. Quite a few posters here have no oil consumption problems at all......Heck, my late '02 STS, at 41,500 miles, uses less than 16 oz. of oil in 3,000 miles of rural and highway driving. And I do WOT's and run it to 132 mph fuel cutoff regularly. (Which is one reason I just spent $635 for new V-tires).
Shell gasoline ruined the gas gauge (or sending unit) in our Explorer some years ago. It's about the only top tier in my area, but I'm not likely to use it anymore. I mostly use Amoco now, but it's not on the list. I'll have to check around and see what's available.
If shell is on the list then it is ok now!
I am sure reduction sulfer is part of Top Tier.
I just have a hard time believing that would be an actual intake valve after 10k miles (right?) seems like by 100k there would be nothing left of it....
With that said.... I've decided to take the 8 mintue journey to Chevron instead of the mini-mart station 30 seconds down the road.... plus its a penny or so cheaper.
:confused: Highway...........Who's selling branded AMOCO? I thought they were absorbed by BP (British Petroleum) a couple of years ago. ?????????? If Shell ate the fuel unit in an Explorer, how come the other 1.765 quadrillion Explorers don't have the same problem???? Seems to me that Shell is (even if it IS a Netherlands company) one of the last of the "American" brands. QUICK.......! Name all the American oil companies from ......1955. < NEW THREAD !!!!