Originally Posted By: 1bioguy
Originally Posted By: ShotGun429
(because it doesn't relate to real world engine wear)
+ one
Why? Seems like it would, pressure/friction etc. Can you expound?
Buster nailed it in his post from 2009:
Originally Posted By: buster
This has been addressed a billion times. Noria had a good write up about it and essentially it's used as a screening test for additives. Has poor correlation to real world engine testing.
Oils have to go through sophisticated, controlled engine sequence testing to prove their wear capabilities.
Quote:
"The 4-ball test (ASTM D4172) is often used as a screening test for many different lubricant types that contain antiwear additives or similar base oil properties. Other tribo-mechanical bench tests are often used as well, including the Timken Test (ASTM D2782) and the Pin and V-Block (ASTM D2670). Because engines have different contact geometry, loads, metallurgy and speeds, numerous bench tests and test protocols are needed. It is not uncommon for several oils to be tested using two such methods and to find that the performance rankings between the oils to reverse (no correlation). This is why, among other reasons, Passenger Car Motor Oils and Heavy Duty Oils (diesel crankcase) are tested in actual engines using controlled methods such as ASTM D5533 Sequence IIIE and D5302 Sequence VE.
Jim Fitch, Noria Corporation"
