When the viscosity drops, intrafluid friction also drops. Of course, wear protection isn't a concern in the Sequence VI test.
Fuel economy is the only concern.
After testing, the independent test facility changed its tune. In fact, it was the highest Sequence VI score ever recorded by the facility. Field results bear out the test. Reports indicate that Series 2000 consistently gives users a fuel economy increase, with increases varying between four and 40 percent. Series 2000 doesn't slack on the wear protection, either.