Sorry, I don't buy the alarmist interpretation of those figures.

Take a more careful look at the numbers.

Iron is 72 ppm

Aluminum is 71 ppm.

If you acheived these numbers in 3K miles, you've got cause for concern. But after 20K miles, they don't look very bad at all. These figures would correspond to 10 ppm for 10K miles. That's hardly a concern.


Cu at 37

Pb at 4

Sn at 5


What's wrong with these figures? To claim elevated numbers for a 20K run is ridiculous.


Si at 17

Na at 10.


I get more sodium at 5K on the 603.

Si is not significant for 20K of use.


The only criteria which I find a bit of a concern is viscosity........83.7.........but it only corresponds to a 40W oil. In reality, it's not an issue.


.4% insolubles.

We tolerate up to 2% insolubles on diesels and have nary a care about it. How can .4% be an issue?


TBN 2.1

At the lower limit of acceptability. Perfect time to change the oil.



Sorry, Blackstone is alarmist and there is nothing that's going to cause significant harm to that engine with the figures as indicated.

Moral to story: Educate yourself as to the specific parameters in the oil and make your own judgment. Don't allow the geniuses at Blackstone to do it for you. They are comparing this oil to a typical 3K change. Obviously the figures are going to be elevated.