I believe that it is for the specific engine in question. The problem is that it is based upon their ave miles as reported in the samples. So, you may have 5000 miles on your sample but their ave is based upon 3000 so somewhat meaningless. As noted by several on this board in today's computer age it is simple to program the model to produce either a wear metal average in ppm/1000 miles and/or do the calculation to adjust it to your mileage. At least for wear numbers and perhaps silicon. Other issue is that they do not inform you as to how many samples in their database for your engine and year. IF the ave has only two samples, again a pretty meaningless number. Now over a dozen maybe has some value. I was hoping that Blackstone would inmprove this aspect of their reporting but to date they have not.
