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www.bobistheoilguy.com
Are you SURE it was changined 15,000 miles ago? Did the dealer tell you this? From these #'s, he either put in some weird oil or it was run very long.
The viscosity is unusually low, and the calcium seems to be low too. It's possible they did NOT put in a regular 15w40! Iron seems a bit high. Everything else looks good.
Do a sample next time, and compare to this sample.