SwRI: Sequence VIII Test Procedure for API SJ, API SL, API SM

  image of the Sequence VIII test at SwRI, which evaluates a lubricant?s performance for resisting copper-, lead-, or tin-bearing corrosion and measures viscous shear stability during high-temperature operating conditions using unleaded fuel
 

The Sequence VIII procedure at SwRI evaluates a lubricant's performance for resisting copper-, lead-, or tin-bearing corrosion and measures viscous shear stability during high-temperature operating conditions using unleaded fuel.

The Sequence VIII procedure evaluates a lubricant’s performance for resisting copper-, lead-, or tin-bearing corrosion and measures viscous shear stability during high-temperature operating conditions using unleaded fuel.


The Sequence VIII test is required for API categories:

  • API SJ

  • API SL

  • API SM

Sequence VIII Test Equipment and Procedure

A 42.5-cubic inches of displacement (CID) carbureted, single-cylinder, spark-ignition, Cooperative Lubricant Research (CLR) oil test engine is operated with an external oil heater circuit.


The engine runs continuously for 40 test hours. Test speed is 3,150 rpm. Oil temperature is raised to 143 °C (290 °F) using an external oil heater.


Sequence VIII Test Results

At the end of the test, the following are evaluated:

  • The connecting rod bearing weight loss is measured.

  • Used lubricant is analyzed for kinematic viscosity.

  • Multigrade oils require 10-hour stripped viscosity.

Sequence VIII Pass/Fail Criteria

PASS

FAIL

 

Pass/fail criteria are:

  • 26.4 weight loss maximum

  • Stripped viscosity must stay in grade

For more information about the Sequence VIII procedure capabilities at Southwest Research Institute (SwRI) or how you can contract with SwRI, please contact Fred Gerhart at fgerhart@swri.org  or (210) 522-3842.

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Southwest Research Institute® (SwRI®) is an independent, nonprofit, applied engineering and physical sciences research and development organization with 12 technical divisions using multidisciplinary approaches to problem solving. The Institute occupies more than 1,200 acres and provides nearly two million square feet of laboratories, test facilities, workshops, and offices for more than 3,300 employees who perform contract work for industry and government clients.