That document spells out the standardized test requirements to validate a Top Tier detergent package. It is not a mandate as to the formulation at the pump. Various base fuels are specified for the various performance tests:
4.3.1 Intake Valve Keep Clean Initial Performance Standard
4.3.1.2 Base Fuel. The base fuel shall conform to ASTM D4814 and shall contain commercial fuel grade ethanol conforming to ASTM D4806. All gasoline blend stocks used to formulate the base fuel shall be representative of normal territory 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 to accelerate deposit build-up are prohibited unless approved by GM engineering in advance of engine testing. The base fuel shall have the following specific properties after the addition of ethanol:
1. Contain enough denatured ethanol such that the ethanol content is no less than 8.0 and no more than 10.0 volume percent as measured by ASTM D 4815 or D 5845. In markets with lower fuel ethanol content, fuel matching the market conditions of fuel ethanol content can be used up on approval.
2. - 7. Snipped.
4.3.2 Combustion Chamber Deposit Initial Performance Standard
4.3.2.2 Base Fuel. Combustion chamber deposits shall be measured for the base fuel from 4.3.1.2.
4.3.3 Intake Valve Sticking Initial Performance Standard
1. Test fuel shall be either the same as in 4.3.1.2 or CEC valve sticking reference fuel.
4.3.4 Gasoline Direct Injection (GDI) Engine, Fuel Injector Cleanliness Performance Standard
4.3.4.2 Base Fuel. Testing must be conducted using Haltermann Test Fuel Solutions Product No. HF2208 Gasoline
for LHU Injector Deposit Test. This test fuel has a specific formulation proven to cause deposits on the inside of the
injector and fuel spray holes and therefore should only be sourced from Haltermann Test Fuel Solutions.
4.4.1 Stochastic Pre-ignition (SPI) No-Harm Demonstration
4.4.1.2 Test Fuel – Testing must be conducted using Gage Products Test Fuel TTG-1-002 TOP TIERTM SPI Test Fuel. This Test Fuel has a highly controlled fuel composition from batch to batch yielding tight control of its particulate matter index (PMI) and therefore should only be sourced from Gage Products in Ferndale, Michigan.
4.4.2 No-Harm Particulate Emissions Requirements
4.4.2.2 Base Fuel Both phases of Soot Testing (Base Fuel and Base Fuel plus candidate Additive Package) must be conducted using Haltermann Test Fuel Solutions Product No. HF2208 Gasoline.
4.4.1 Stochastic Pre-ignition (SPI) No-Harm Demonstration
4.4.1.2 Test Fuel – Testing must be conducted using Gage Products Test Fuel TTG-1-002 TOP TIERTM SPI Test Fuel. This Test Fuel has a highly controlled fuel composition from batch to batch yielding tight control of its particulate matter index (PMI) and therefore should only be sourced from Gage Products in Ferndale, Michigan.
4.4.3 No-Harm Gasoline Chemistry Performance
Additive Package Miscibility– Ethanol Content: SPI 4.4.1.2 Base Fuel + 5.0 V% Ethanol + Additive Package
If one is going to post a reference in support of their position, they should at least understand that reference well enough to determine if it actually supports one's position.
Ed
