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That was a interesting read. I am not too worried about an extra 3%(6.6gr)of dust in my engine. The report states that the dust goes into the oil, so change you oil at recommemed intervals or more.

The air dust is the major enemy of your engine. The dust goes into the oil and it is VERY BAD. The oil filter is unable to cach thiese fine hard parts of sand and they circulat into the engine again and again.