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What is the Four Ball Wear Test? How good a predictor of engine wear is it?
 The Four Ball Wear Test puts one rotating ball against three fixed balls under specific conditions of pressure, temperature, revolutions per minute and duration. The test may be used to evaluate the friction- and wear-control ability of liquid lubricants or greases in sliding contact. The Four Ball Wear Test is a good laboratory tool for developing oils with good engine wear control.
The results appearing on the AMSOIL Series 2000 20W-50 Racing Oil (TRO), Series 2000 0W-30 Motor Oil (TSO), and Series 3000 5W-30 Heavy Duty Diesel Oil (HDD) were from testing done by a well known independent lab. Such a facility would not jeopardize its reputation by misrepresenting test results just because AMSOIL was paying for the tests to be performed.
AMSOIL ran literally thousands of tests in our own lab before we sent the product for testing. The independent lab's results correlate very well with our own.
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