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From where does the Voodoo oil consumption come from?

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T7TheLama

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Well dang, from one quart per 5-600 miles to zero in 900 miles?

Did you use the UPR pcv, or something else?
Bought a new oem pcv valve. I also tried to reduce engine braking to minimum, cause i read somewhere that this could also cause excessive consumption. I was a bit supprised by the outcome. At best i thought i could reduce it a bit, but zero consumption was a bit shocking.
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...Also my front splitter flew away.
So, back in 2016 when the GT350 was first introduced, the front splitters were shipped in the trunk for installation at the dealer. At the time, dealership techs didn't understand that the front splitter was an aerodynamic component - they thought it was just a decoration. So they clipped it in at the front, put in the back row of screws and sent the car on its way. At about 90MPH the splitters would detach and drag on the ground under the car. Sound familiar?

Here's how Ford said that they're supposed to be installed:

 
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So, back in 2016 when the GT350 was first introduced, the front splitters were shipped in the trunk for installation at the dealer. At the time, dealership techs didn't understand that the front splitter was an aerodynamic component - they thought it was just a decoration. So they clipped it in at the front, put in the back row of screws and sent the car on its way. At about 90MPH the splitters would detach and drag on the ground under the car. Sound familiar?

Here's how Ford said that they're supposed to be installed:

The fastest i went was 170mph, but at 90ish mph the splitter said goodbye. But the way it did detach was the same way you described it. I had to stop at a gas station and buy some tools to unscrew the part that dragging on the street. The only Problem was that the Car was to low so i searched for a big enough stone for clearance

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Bought a new oem pcv valve. I also tried to reduce engine braking to minimum, cause i read somewhere that this could also cause excessive consumption. I was a bit supprised by the outcome. At best i thought i could reduce it a bit, but zero consumption was a bit shocking.
Do you have a passenger side oil separator? I would think if that much oil was getting sucked through the PCV valve a separator would be filling up very quickly? Maybe it's not that simple...
 

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12-1 compression - Low tension rings. Recirculating oil via PCV gets frothy and gums up the rings each pass. Install separator, clean carbon from rings. Drive.
 

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Do you have a passenger side oil separator? I would think if that much oil was getting sucked through the PCV valve a separator would be filling up very quickly? Maybe it's not that simple...
No i never had one installed
 

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I would think if that much oil was getting sucked through the PCV valve a separator would be filling up very quickly? Maybe it's not that simple...
Hello; I started driving in 1963. Mostly 1950's vehicles until 1970. Engines did not have PCV valves. The vapors from inside the engine block were vented directly into the air. Often thru what knew as a down tube. Sometimes just a cap of sorts on the rocker arm/valve covers which did double duty as a place to add oil.

Along the line it was determined these vapors were bad for the environment. The solution was to pipe those vapors into the intake manifold where they would go into the combustion chamber to be burned along with the fuel.
There was a problem with the plan. That being engine vacuum during the intake stroke. Oil is being splashed around inside the valve covers from movement of the rocker arms (cams in an overhead cam engine) Engine vacuum would also suck oil into the intake manifold along with the other vapors.
To help with this the PCV valve was made. Is supposed to allow vapors into the intake only under some conditions. So, you are correct in that if there was an open tube it would allow lots of oil to be sucked into the intake manifold and an oil separator would fill up quickly. The PCV valve being plumbed into the tube prevents that.

I was using a bit of oil in my car a few months ago. I replaced the PCV valve and stopped the issue. The old one broke upon removal. Pretty simple with a spring and machined metal plug which fits into the housing.
 

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No i never had one installed
If you don't have a separator, all of the blow by is going right back into your engine. Ford recommends separators, but due to smog reasons, can't sell the car with them installed. For some reason, the EPA thinks it's better to burn the oil than to remove it altogether.
 

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If you don't have a separator, all of the blow by is going right back into your engine. Ford recommends separators, but due to smog reasons, can't sell the car with them installed. For some reason, the EPA thinks it's better to burn the oil than to remove it altogether.
Hmmm... I don't think "smog reasons" are a factor in this - it's really about cost. Every car except the GT500 CFTP comes without a separator. If Ford had installed separators like the 2016 FP left and right units, most owner's would be annoyed having to take the car to the dealer (and pay) every 1000 miles to get the separators emptied. So they're not installed. The GT500 separator drains back into the sump, making it maintenance-free. It came installed on CFTP's, but not on non-CFTP's, and again, it's probably because of cost (to Ford) of installation.
 

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Hmmm... I don't think "smog reasons" are a factor in this - it's really about cost. Every car except the GT500 CFTP comes without a separator. If Ford had installed separators like the 2016 FP left and right units, most owner's would be annoyed having to take the car to the dealer (and pay) every 1000 miles to get the separators emptied. So they're not installed. The GT500 separator drains back into the sump, making it maintenance-free. It came installed on CFTP's, but not on non-CFTP's, and again, it's probably because of cost (to Ford) of installation.
As far as i understand, the oil blow by must be send back to burn. I've changed my oil before after being a couple quarts low and it was very VERY frothy - prior to separators. I can only imagine what that does to low tension rings. My opinion is, that's why oil consumption gets worse over time. Rings get gummed up and less springy. It's a vicious cycle that tends not to end well.

This is all a common sense guess on my part. I believe Ford 'fixed' this issue with their 'gen2' motor by putting in a higher tension ring (at the cost of HP?)
 

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Hello; The f-150 I looked at was a left over 2019. Do not know if I passed up a good deal on a good truck or not.
My '19 F150 with the 5.0 burned roughly a quart every 1,000 miles until it was nearing about the 7,000-8,000 mile mark, and then it tapered off dramatically. It burns maybe a half quart now at the most during my 5,000 mile change intervals, currently on the edge of 30K.

I break engines in aggressively. Heat cycle a few times, then let it eat. Even so, it took my truck's engine a while. Based on my experience, and others I've seen on the truck boards, the rings take forever to seat with the plasma bores. Seems to me there might have been a TSB about it, and a tune revision that reduced off-throttle vacuum too.
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