The development of JASO GLV-1 -Next Generation Low Viscosity automotive Gasoline Engine Oils Specification 2020-01-1426
It is a common understanding that reducing engine oil viscosity has a great effect on improving fuel economy. However, it has been impossible to evaluate ultra low viscosity engine oil below SAE 0W-12 utilizing the existing fuel economy test method and there is no specification for ultra low viscosity gasoline engine oil. Therefore, we developed firing and motored fuel economy test methods using Japanese automobile manufactures’ engines for ultra low viscosity oil at the Task Force (hereafter called TF) mainly consist of Japanese automobile and petroleum industry. Furthermore, the TF developed JASO GLV-1 specification including these fuel economy tests for next generation ultra low viscosity automotive gasoline engine oils such as SAE 0W-8 and 0W-12.
In development of JASO GLV-1 specification, Japanese fuel economy tests and ILSAC engine tests for engine robustness evaluation were used. The fuel economy and engine robustness tests of four reference oils (two of them were SAE 0W-8 and others were SAE 0W-16) and three demonstration oils (SAE 0W-8) were evaluated to examine whether it was possible to evaluate SAE 0W-8 by each test method and examine the JASO GLV-1 specification value.
In fuel economy tests, the demonstration oils GE308 and GE408 showed superior fuel economy improvement effects compared to the general fuel economy oil GE216 which was SAE 0W-16 w/o molybdenum FM. In engine robustness tests, only GE308 satisfied the specification value of ILSAC GF-5. These results confirmed that high fuel economy and engine robustness by ultra low viscosity oil such as SAE 0W-8 can be achieved.
JASO GLV-1 specification, fuel economy performance was defined by the fuel economy tests using Japanese automobile manufactures’ engines, and engine robustness performance was defined by ILSAC GF-5 specification. We have also confirmed that GE308 fully meets the specification. This standard became effective in April 2019.