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Have you always run Platinum oil? Wonder what other guy is running? I run mobile 1 5w40 turbo diesel oil since truck was new .
 

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Discussion Starter #42
Well I ran motorcraft oil on the previous change and I believe even the one before that. It didn’t seem to make the problem occur like what it’s doing now, but I don’t think the issue had fully gone away from the oil change prior to that one. So the truck still wasn’t running great but it didn’t seem to get any worse.

At around 5000 miles on the motorcraft oil is when I changed it this past time. And it was running perfect for probably a thousand miles or so before that.

Next oil change I’ll be going back to motorcraft to see if there was indeed a difference or not.


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Add me to the list cause I'm having this issue now after my last oil change. Anyone else have a loss in mpg as well? I was getting around 16 to 18 mpg but now its around 12 mpg?
 

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Discussion Starter #45
Well it's that time again!

The truck just turned 60,000 miles so I changed the oil over the weekend with Motorcraft 5w30. Immediately upon driving the knock sensor, spark advance, and oar readings are all showing poor numbers. This time I was on the stock tune prior to doing the oil change so I know it has nothing to do with the tune. Truck is definitely down on power now. This is so aggravating that an oil change alone can cause a vehicle to run so poorly, when is was just running so well.
 

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So strange.
I'm convinced that if we knew exactly what caused it, it would actually make sense. But we don't, so it seems so implausible.

I really want to know.

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Here's an idea, but I'm no expert. You say the only difference is the oil change. What is the difference between the new oil and the old oil? Perhaps when you change the oil, it has better viscosity than after it's been abused and fuel diluted in the motor for a while. Could this be a flow of oil issue? Perhaps you have a partial clog somewhere, such as the dirty screens on your VCT solenoids. Old oil slips past easily, whereas new oil takes time to work it's way in there? You say it gets better over time, so as the oil get's "broken in" and diluted with fuel a bit, it flows faster. Just a thought.
Have any of you looked into what DNA Dan said here? Sounds like a solid possibility. Are any, or all of you running with a catch can? Is everyone having this issue also running a tune? Have you all switched oil weight at one point? You all need to try to find a common item here besides after an oil change. I’m no expert, but I have a lot of quality assurance background and the best way to find where the bug lives is to find all the commonalities.


2013 F150 XLT 3.5L
 

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Discussion Starter #48
I can remember it doing this even when new so I know it can’t be from clogged orifices.
I’ve only used 5w30 oil, just different brands like Mobil 1 & Pennzoil Platinum, along with Motorcraft of course.



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Thinking about this , like i said before i get higher knock readings after an oil change but no erratic acceleration. I wonder if resetting the oil life monitor has anything to do with it ? I usually reset mine after the oil change when i first start to check for oil pressure. Next oil change i won't and i will see if knock readings go up.

Another idea disconnect battery during the oil change , and do a reset . See if that changes anything.

Crazy sh!t
 

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Both my 2013 and 2018 F150's have acted "strange" after an oil change. My deductive reasoning is that the computer has a relearning process and can't tell right away that the fresh oil is new...per se. I changed my oil on Saturday morning and drove like a grandpa on my normal routes and only averaged 18.7 mpg. Since then, while still driving the same routes, I am up to 22.1 mpg. Truck is now also shifting better.

Like I said, I noticed the mpg drop on both of my trucks..not sure if this may have an effect on the OP's acceleration issues but wanted to throw my .02 cents in.
 

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I would bet there is a difference in the way the turbos spin with the new oil. Any bearing turning at 80k rpm is going to be sensitive to the lubricant in it. Whether it’s higher viscosity or different flow, there must be enough difference in intake air flow/pressure for the computer to need to adjust the long term ratios again. That would take some time and drive cycles, I suspect.
 

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Discussion Starter #52
I think the erratic acceleration was due to the resetting of everything when flashing to and from the stock tune on previous oil changes, that was coupled with this current issue.

This past oil change I left everything alone and had it back on the stock tune days before doing it. It doesn’t have the erratic acceleration this time but it’s definitely down on power and all my readings are poor, like wastegate percentage, spark advance, and knock.


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