I now have my car back from having the coolant leak into the oil repaired. As soon as I drove it home I did an oil and filter change because of residual oil and coolant remaining with the dealer's changing it. In several days I'll do another change and drive it on that change only a few days. Then I'll change again and go back with normal 7.5k mile changes. The repair was done under warranty. This is a case where UOA practice paid off big. Otherwise, I wouldn't have known till it was too late.