What is so wrong about this rat540 test? Not testing motor oils in motors? LOL
He's using a one armed bandit with cold oil. None of which represents how an oil behaves in an internal combustion engine. Pert plus scores very high using this testing protocol,bet it keeps engines clean too(sarcasm)
This nonsense test gets posted at least once a month since I've been a member,and it gets discredited each time.
There is a reason oil manufacturers use real engines in their test beds,because it's the only accurate way to test a formulation.