Outstanding Brad Penn UOA 10w30 on 2.0FSI

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Originally Posted By: Audi Junkie
How in the world can an oil work well enough to PRODUCE a good UOA, if the oil was somehow deficient?


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Originally Posted By: Audi Junkie

High Accuracy, Low Precision:

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High Precision, Low Accuracy:

100px-High_precision_Low_accuracy.svg.png


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What a great illustration to make a point!
 
Originally Posted By: Audi Junkie
Originally Posted By: Audi Junkie
How in the world can an oil work well enough to PRODUCE a good UOA, if the oil was somehow deficient?


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Obviously, it can't but too many people take one low end UOA (e.g. w/o TBN or PQ, PC, etc) and turn it into some indication of divine greatness in a particular oil. There's lots more too it, as you know.
 
If you want to know how much an engine is wearing, you have to measure the engine to find out. Measuring the oil only tells you how much wear there is on the oil itself.

The range of particle sizes detected in a UOA is so narrow that large wear particles can be present but not detected. It's not a paradox that a very slow-wearing engine that produces very small wear particles could have a higher UOA metal reading than a faster wearing engine that's producing larger, undetectable, wear particles.
 
Originally Posted By: Audi Junkie
Originally Posted By: Audi Junkie
How in the world can an oil work well enough to PRODUCE a good UOA, if the oil was somehow deficient?


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