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Just got my oil analysis in from Blackstone. Here is what they had to say in there comment section
"Nothing unusual showed up in this sample from your 7.3 diesel. Universal averages show typical wear for this type of engine after about 5,300 miles on the oil. This oil was used longer than that and wear compares very well with averages. In fact, nothing in this wear pattern shows anything amiss inside this engine. The 6.8 TBN shows lots of active additive left. The viscosity was 15w/40 and the trace fuel is a nonissue at this level. Try running 8500 miles on the next oil and check back."
My sample had about 6,500 miles on it. I used 14 quarts of Motorcraft 15w40 and 1 quart of Lucas synthetic additive. Based on this sample I am going to stick with my current oil and additive brand and change my oil at 7K miles next time. I would like to try the Valvoline Blue that rated high in the test, but I can't find it in my area. I also usually change the oil at 6K miles. I just happened to run over this time. Good to know the oil could take it. As far as the argument against Lucas. Well, it did not affect my oil weight in any way. I think the test mentioned earlier was not very controlled. Ratios were not at Lucas's recomendations and that video used the standard Lucas, not the Synthetic that I use.
I getting ready to make the first oil change in my '08. I'll let you know what I find in it.
Also, I am sending a sample from my race car in to see how it fared. It is an open track car that sees 25 minutes of sustained 5K rpm use. I use sythetic oil and Lucas Synthetic additive in it. I'll let you know how it turns out as well.
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