A professional who subjects petroleum fuels and lubricants to simulated operating conditions in full-scale test engines to obtain evaluating data. Responsibilities include:

• Runs tests with gasoline, diesel, aviation, and supercharged research test engines, dynamometers, and other mechanical testing equipment, varying such factors as speed, temperature, load, fuel, and bearing, motor, or chassis lubricants as specified.
• Records horsepower ratings and other performance data.
• Tests fuels in standardized knock-rating test engines to obtain data for determination of octane or cetene values.
• Adjusts and makes minor repairs to engines during test runs.