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New GF-6 Motor Oils Required Rigorous New Tests - Engine Builder Magazine
As engines in cars, trucks and SUVs have become more efficient in an effort to reduce emissions and increase fuel economy, the use of low viscosity motor oil has become an essential part of their operation. With advancements such as gasoline direct injected (GDI) and turbocharged direct injected...
www.enginebuildermag.com
"The engine wear test is 200 hours involving 24,000 thirty- second cycles, with each cycle consisting of four stages: two steady-state stages with transition ramp stages between them. The LSPI test consists of four iterations. Each iteration is 175,000 ignition cycles from each cylinder with the first 170,000 valid cycles evaluated for the number of pre-ignition events."
“The tests are designed to create extreme conditions so that new oils are robust enough to perform properly across an entire auto drain cycle which can be as high as 10,000 miles.”
The official name of each of the seven new/updated tests is detailed below:[ii]
- Sequence IIIH Engine Test – Oxidation and deposits
- Measure lubricant thickening and piston deposits under high temperature conditions.
- Sequence IVB Engine Test – Wear
- Evaluate the effect of an automotive lubricant on tappet wear for engines with direct-acting overhead cam valvetrains.
- Sequence VH Engine Test – Sludge and varnish
- Evaluate the performance of a lubricant in controlling low temperature engine deposits under operating conditions deliberately selected to accelerate deposit formation.
- Sequence VIE Engine Test & Sequence VIF Engine Test – Fuel economy
- Provide a comparative fuel economy index (FEI) of the fuel-saving capabilities of automotive engine oils under repeatable laboratory conditions.
- Sequence VIII Engine Test – Corrosion
- Evaluate the performance of a lubricant in preventing copper/lead/tin bearing corrosion and measure viscous shear stability under high-temperature operating conditions using unleaded gasoline.
- Sequence IX Engine Test – Low-speed pre-ignition (LSPI)
- Evaluates the ability of a motor oil to mitigate pre-ignition in the combustion chambers of gasoline, turbocharged, direct injection (GTDI) engines under low-speed and high-load operating conditions.
- Sequence X Engine Test – Chain wear
- Evaluate a lubricant’s performance to protect against soot-induced timing chain wear experienced in modern gasoline direct-injection (GDI) style engines.