SwRI: Mack T-10 test simulates heavy-duty, on-highway truck operations

	Mack T-10 procedure evaluates an oil's ability to minimize cylinder liner wear, piston ring wear, and bearing wear.

The Mack T-10 procedure evaluates an oil’s ability to minimize the following in engines with exhaust gas recirculation (EGR):

• Cylinder liner wear

• Piston ring wear

• Bearing wear

The Mack T-10 is part of the API CI-4 engine oil category and simulates heavy-duty, on-highway truck operations after 2002.

Mack T-10 Test Equipment and Procedure

The Mack T-10 test engine is a modified Mack E7 E-Tech 460 rated at 460 bhp and 1,800 rpm, with EGR. In this 300-hour test, the first 75 hours are at rated speed and power to generate soot. Then, the last 225 hours are over-fueled at peak torque rpm to maximize the wear rates on the rings and liners.

Test Results

At test end, the following criteria are evaluated:

• Piston ring wear

• Cylinder liner wear

• Lead content

• Oil consumption

Used oil analysis includes:

• Viscosity at 100°C

• Soot

• Total base number (TBN)

• Total acid number

   (TAN)

• Lead content

Pass/fail criteria include:

• Mack merits: 1,000, min. with

  • Oil consumption: 65 g/h, max.

  • Ring weight loss: 158 mg, max.

  • Liner wear: 32.0 mm, max.

  • Used oil lead level:

    • 0–300 hr, 35 ppm, max.

    • 250–300 hr, 14 ppm, max.

For more information about the Mack T-10 procedure capabilities at Southwest Research Institute (SwRI) or how you can contract with SwRI, please contact Ryan Johnson at rjohnson@swri.org or (210) 522-2892.