Delvac Vs. Mobil 1 HM, 2009 3.7 Mazda CX-9, 10K Interval UOA's

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May 12, 2019
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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".
s
 

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I don’t think that the engine noticed a difference in oils in regards to wear. Looks nearly identical, which is a good thing.

Another run is needed to confirm reduced oil consumption.
 
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Looks good. Delvac held up extremely well for 10k, interesting how it retained it's viscosity better than the "fully synthetic" 10w40, despite the M1HM starting with a higher KV100.
 

Stumpy

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Looks good. Delvac held up extremely well for 10k, interesting how it retained it's viscosity better than the "fully synthetic" 10w40, despite the M1HM starting with a higher KV100.
I was surprised since Delvac is just a blend but **** at what a blend it is! Money wise, it whipped the M1 soundly. $12.99 gallon before $3 rebate!
 

4WD

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Delvac uses some of XOM’s EHC … so even the Grp2 portion is high quality
 
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