Early this year, Chevron Oronite initiated an effort to extend the use of the Kurt Orbahn test. While it is an inexpensive test, rules for this alternative do not encompass emerging viscosity grades such as SAE 0W-16. The diesel injector shear stability test (ASTM D6278), also known as the Kurt Orbahn test, has been used as a surrogate bench test for many years. The test has flexible base oil interchange and viscosity grade read-across rules for bearing corrosion but not for shear stability. But as with any engine test, it is costly, especially when measuring the shear stability of multiple formulations. The Sequence VIII engine test has been used since the introduction of ILSAC GF-3-the passenger car engine oil specification that debuted in 2001-to measure viscous shear stability, in addition to evaluating lubricant performance in preventing corrosion in copper, lead and tin bearings.
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