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Did you consider taking a sample from the dipstick tube and having it analyzed now? That way you will know what effect, if any the GM oil/additive had on the chemistry. Also as you stated, you can still get some good information based on wear metals

pgtr, Are you capable of arguing a point without resorting to personal attacks? Myself, and I’m sure many others find this incredibly distasteful and irritating.

pgtr You started this discussion by stating the following: "In theory I'd think they could pretty much account for everything except dusty operating conditions (and even that could be done if there was some sort of air filter monitor... hmmm)" You used the word everything! That statement is...

Some of the wear metal read lower on the more recent sample. Is +/- a few ppm the accuracy of the measurement equipment?

"So you will have zinc in the oil, but the zinc cannot rebond to the metal as it did before." Molakule, Do I understand this correctly? Using your example say you have the oil analyzed at this point you will still read 1,895 ppm of zinc, even though the zinc compounds cannot bond to the metal?

I think this indeed shows that here in North America we are being asked to sacrifice engine wear for CAFE!! It's my understanding that Japanese companies make similar reccomendations for their cars sold in Japan.

BMW and Mercedes recomend very thick oils such as 5W-50 Their engines are probably some of the tightest engines in the world. So I don't think that tight engine theory holds water. Also it gets cold in Germany, so I don't think thats a concern. Bottom line The Germans may be right about using...

Terry, no sorry they only listed the Viscosity at 100F. What I found interesting is that Ford and apparently Honda use Moly in their break in oil. It goes against the theory that break in oil shouldn't have high amounts of anti wear additives.

I found this from another website. Comment by Blackstone labs Comments for 2001 Mercury Grand Marquis Factory 5W/20 oil analysis at 176 miles from Blackstone Labs: This is the kind of wear-in oil Honda uses, that reads quite light in viscosity and has a heavy molybdenum additive in it."...