Have never posted my wife's CX-9 UOA's. 3.7 Ford Duratecs are infamous for fatal water pump leaks so that is why I do UOA's on her ride mainly.
I used Delvac 1300 15W-40 and previously had used Mobil 1 High Mileage 10W-40. Duratec 3.7's are also notorious oil consumers in these heavy vehicles. My theory is that that high revving 3.7 just don't have the torque for a 4400 pound vehicle. I noticed that when I ran 5w-20 and 5w-30, it used lots more oil, say 1.5-2 qts per 10K miles. Using high viscosity oils seemed to reduce the oil consumption. No leaks. Interesting the results from a HDEO versus a "synthetic".
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I used Delvac 1300 15W-40 and previously had used Mobil 1 High Mileage 10W-40. Duratec 3.7's are also notorious oil consumers in these heavy vehicles. My theory is that that high revving 3.7 just don't have the torque for a 4400 pound vehicle. I noticed that when I ran 5w-20 and 5w-30, it used lots more oil, say 1.5-2 qts per 10K miles. Using high viscosity oils seemed to reduce the oil consumption. No leaks. Interesting the results from a HDEO versus a "synthetic".
s