All good points, all of which are plausible. And to be honest, I really think we both see it the same way.I am answering this not to continue to banter, but more for those who may stumble on this thread want a better understanding. I agree with you that it is totally ok to follow Ford's recommendation(s), though I would love to see where they say >250°F oil temperatures are normal.
For your questions:
Why was your viscosity so low already with only 1000 miles? Good question and it could be the oil type, it could be the engine break-in that was happening, maybe it was filled with the wrong oil from the factory, and we may never the root cause. With that said, it DID happen and without testing the oil I would have never known. Had I done what nearly everyone else does, I would have left the oil in the engine until the iOLM said to change it thereby stacking 5,000 miles or so on oil that does not meet the minimum viscosity requirements thereby increasing wear during the beginning of the engine's life.
Was it because of the 2.5% fuel dilution? Why did you have 2.5% dilution at 1000 miles already? Another great question. Likely due to the rings not being fully seated, but all DI engines have fuel dilution and the 2.7L is no different even with the introduction of MPI for low-speed use. Again, this was 1,000 highway miles where dilution should be the least. Had I not tested the oil, I would have never known.
Maybe if your oil temperatures actually reached correct operating temperature, you wouldn’t have 2.5% dilution in 1000 miles. How could it not have reached correct operating temperature? It was a road trip from the dealership in Dallas where I bought it to Cheyenne, WY and back to Colorado Springs. It was definitely at operating temperature (though I never saw any temperature above 220°F) for hours without stopping.
Not to argue, but sustained oil temperatures of 250°F or higher are not normal. Temperatures can spike that high under a load, but they will almost always drop down very quickly when the load or condition that caused it is removed. If an engine is frequently running oil temperatures at 250°F or higher, then there is a mechanical problem that should be investigated and resolved.
In all of the vehicles I have owned in my life and it has been dozens, I have never owned one that had oil temperatures even come close to 250°F for any length of time. Perhaps I have been lucky enough to own the unicorn of each model. Who knows...
I just think there is a large disconnect between our understanding of what “operating temperature” means and you seem to be stuck on this sustained value so I just wanted to clear this up..
I never once said that sustained oil temperatures above 250 are normal.
All I stated was that operating oil temperature specifications is 230-260. Operating temperature is a maximum allowable temperature range that it should operate at. This doesn’t mean the vehicle should drive around constantly at these higher temperatures. Temperatures will obviously fluctuate. Like you said, temperatures will spike and then come back down depending on driving conditions.
For example: the 10R60 operating temperature specification is 206-215. That doesn’t mean that it will get that high, or should stay that high. I drive 40 miles one way to work everyday going 80 down the highway and it rarely gets to 185. Same with my engine oil temperatures, they likely don't reach 230-260, nor would I want them to when just driving down a highway.
My original comment to this thread, when the OP asked if getting up to 234 was okay. Me saying 230-260 didn’t imply that it should stay that high, it was just to inform him that being that high temporarily was unlikely to harm anything. It’s highly unlikely that it stayed that high for a long duration as it doesn’t sound like he was just driving down the road.
Maybe I should’ve worded my original statement a little better as not everyone understands what I meant by “operating temperature”
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