Shell Rimula R4 L 15W40 How effectively does the oil protect the engine?

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Shell Rimula R4 L 15W40 engine oil test
Round 0 - test at normal temperature
Sample: diameter 2.92
What does the test show?
The friction test is to show the resistance of the oil film to tearing (strength of the oil film).
Metal components in the engine during their operation (friction, for example, pistons) can lead to scratches and nicks. The better quality the oil, the better it should protect the engine, against their formation.
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How does the test proceed?
A new sample is subjected to metal-to-metal friction under a load of 1kg for a period of 5 minutes. The diameter of the sample is then measured at its lowest point. Each new sample has a diameter of 2.92. The lower the result, the better.
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