Updated: Compiled 1NZFE Used Oil Analysis

[Reddog99]

I found the high silicon numbers on so many of the samples to be a bit disturbing, especially the numbers >200. I've run 11,000+ miles on a motorcycle oil change and had numbers less than 10. My understanding is that high silicon numbers indicate bad air filtration.

But after re-sorting by vehicle mileage, it became apparent that most of the high silicon number vehicles had very low mileage. In this case, I'd guess that the high silicon count comes from break-in contamination. It looks like this illustrates a very good reason to change the oil very early. I wouldn't think 100 miles would be too soon.

Also notable was that the three samples using the bypass filters were not showing the great numbers that you might expect, and the silicon count was high. I think they need to change the oil more often...