OK, now that I have EVERYONE's attention, I just got my last oil analysis back from
Blackstone Labs.
Looks like my engine is heading south, and Royal Purple isn't the cause. My iron content
is way above the universal average as well as more than double from the time I sent the
Royal Purple in, and it was high then. Oil in the engine this time is the same as I have
used for the past 100K miles with the exception of 4500 miles which was the Royal Purple.
I've always used Mobil 1 filters. The comments from Blackstone suggest possibly the
valves. That could be since they do a lot of this time of work and are familiar with wear
patterns on these types of engines. My first reaction was a cylinder or 8. Anyone else
want to take a guess? No, I'm not going to tear it down to find out. When it dies, then
I'll pull it down. I'm not too worried about the immediate future though. The engine still
runs like a top, the power is as good as it has ever been, and it's still very smooth.
I've scanned the analysis sheet as well as the sheet which explains what all of the
different elements tested for mean and how they affect an engine. The scans are at:
http://jndneff.home.texas.net/dakota/oil.jpg
http://jndneff.home.texas.net/dakota/info.jpg
John
http://jndneff.home.texas.net/dakota/dakota.html
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