From where does the Voodoo oil consumption come from?

[T7TheLama]

Since i own my 16 gt350 it consumes around 1 liter which is around a quart every 800-1000km or 500-600 miles. It now sits around 70000km or 44000 miles. It has seen plenty of race track and all in all doesn't miss a beat (as long as you refill the oil). Now since i have some time and i have no warranty or any help from Ford anyway i tried to self diagnose where the issue originally stems from. I bought a compression/leak down tester but the adapter doesn't fit so for now i only checked the spark plugs which look totally fine in my opinion. All of the spark plugs look the same.(the one in the picture is from cylinder 8 which i read was the problematic one). I also replaced the PCV valve but still need to check if it got better. I wonder if the spark plugs are completely dry where does the oil come from?

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[wingnutt]

Interesting thread…one school of thought is the rings never seated well with the plasma coating, and engine braking will pull the oil right past the rings every time you downshift, or coast in gear.

an adjustable PCV has recently been thrown out as a possible solution, if not at least a partial remedy…

https://www.uprproducts.com/upr-plu...23-mustang-f150-explorer-hellcat-upr-5045-24/

 

[Crew4991]

 

[T7TheLama]

Accurate depiction

 

[T7TheLama]

Interesting thread…one school of thought is the rings never seated well with the plasma coating, and engine braking will pull the oil right past the rings every time you downshift, or coast in gear.

an adjustable PCV has recently been thrown out as a possible solution, if not at least a partial remedy…

https://www.uprproducts.com/upr-plu...23-mustang-f150-explorer-hellcat-upr-5045-24/

Yea i also noticed with heavy engine braking that the oil consumption is greatly accelerated. Maybe the vaccum is too high?

 

[wingnutt]

Yea i also noticed with heavy engine braking that the oil consumption is greatly accelerated. Maybe the vaccum is too high?

well, if you are seriously using that much…might be worth the 50 bucks to give it a whirl and report back!

 

[CANTWN4LSN]

To answer the question on your particular car you will need to do the compression and potentially the leak down test as you plan and perhaps bore scope to make sure the cylinder walls are ok..
Most likely your car is one with the looser fitting rings. I say that because there are engines of the same year build as yours that burn no oil. Were tolerances off or suppliers different, etc. etc. to account for this? Who will ever know.
You don't say for certain but I'm assuming you owned this car throughout its life to have that knowledge of its consistent oil use. With that many miles and what you describe as a lot of track use you may be due for an engine refresh anyway. If nothing other than rings is the cause of excess oil use then replacing them will probably greatly diminish the added cost of oil use in your car.
At 53000 miles I got tired of a quart per 400-500 miles despite being told it was "normal", demanded a compression and leak down test and had the engine replaced under extended warranty. No oil usage, same driving technique, for 7000 miles now. I am much happier.

 

[sk47]

Hello; A few years ago (early pandemic before things went nuts) I was looking at an F-150 with the Coyote V8. Being blessed + cursed with a need to check thing out I did a lot of searching for information. What I found was some of the F-150 V8 were using lots of oil. A theory at the time was this.

one school of thought is the rings never seated well with the plasma coating, and engine braking will pull the oil right past the rings every time you downshift, or coast in gear.

I did some more looking and found a Ford TSB about this and a video. I may have the links still saved. To summarize under warranty Ford would do an oil consumption test. If the engine failed, they had two sort of fixes.
First was to reprogram the motor which opens and closes the wireless throttle, so it does not close all the way when engine braking. That was to lessen the vacuum within the intake by allowing a path for air. This apparently sort of keeps the oil from being pulled past the rings as much.

The other was to replace the dipstick from one that reads low when down one quart with one that did not show low until two or more quarts low. This puzzled me a bit as it seemed frivolous. Guess it was supposed to give some sort of false comfort. I sort of get that down two quarts in a 10-quart engine is not the same as in a five-quart engine.

Back in the day we called them Monday or Friday cars. Monday being when workers had a weekend hangover. Friday when they were thinking of getting the week over. (that is an old joke) I do not think that sort of thing applies so much. My notion is the range of tolerances for bores, pistons, valve guides seals, rings, PCV valves and such allows for the possibility of a few engines being on the tight side of tolerances. Also a few engines being on the loose side of tolerances.

Most likely your car is one with the looser fitting rings. I say that because there are engines of the same year build as yours that burn no oil. Were tolerances off or suppliers different, etc. etc. to account for this? Who will ever know.

What i determined back in the summer of 2020 was to pass on the F-150 till I could get more answers. I made a thread about the oil consumption question. Sort of luck of the draw thing with oil use, I guess. A sort of notion then being it might take over 10K miles to seat in the rings. You have well over that.

Another thought is to run a different oil. I think some have reported going to 5-w-30 and i think maybe even Ford changed to that oil spec eventually. Might be worth a search or few. I do not know if a 10-w-30 is wise as there are oil driven parts ( cam adjusters & such) which need good oil flow.

A compression and/or leak down test or two might give some answers. Good luck.

 

[wingnutt]

^^^ he’s not wrong, I happen to have one of the 2018 F150s with the 5.0 coyote and it uses oil. Not much more than 2-3 quarts per oil change but it has never gotten better or worse than that…now with 120k on it, and I bought it new off the lot

 

[sk47]

^^^ he’s not wrong, I happen to have one of the 2018 F150s with the 5.0 coyote and it uses oil. Not much more than 2-3 quarts per oil change but it has never gotten better or worse than that…now with 120k on it, and I bought it new off the lot

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.

 

[wingnutt]

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.

depends…we paid just under 50and some change for it in Jan 2019, the same truck today with the same options is 73k

 

[K4fxd]

Maybe the vaccum is too high?

No.

now with 120k on it, and I bought it new off the lot

How did you break it in? I think many with oil problems were babied from the start. These engines need to be run to redline and coasted to idle several times when new to fully seat the rings.

 

[wingnutt]

No.

How did you break it in? I think many with oil problems were babied from the start. These engines need to be run to redline and coasted to idle several times when new to fully seat the rings.

lol…no worries there, I learned almost 20 years ago that breaking an engine in gently is the wrong idea.

… notice the light shiny area on the rollers

 

[T7TheLama]

To answer the question on your particular car you will need to do the compression and potentially the leak down test as you plan and perhaps bore scope to make sure the cylinder walls are ok..
Most likely your car is one with the looser fitting rings. I say that because there are engines of the same year build as yours that burn no oil. Were tolerances off or suppliers different, etc. etc. to account for this? Who will ever know.
You don't say for certain but I'm assuming you owned this car throughout its life to have that knowledge of its consistent oil use. With that many miles and what you describe as a lot of track use you may be due for an engine refresh anyway. If nothing other than rings is the cause of excess oil use then replacing them will probably greatly diminish the added cost of oil use in your car.
At 53000 miles I got tired of a quart per 400-500 miles despite being told it was "normal", demanded a compression and leak down test and had the engine replaced under extended warranty. No oil usage, same driving technique, for 7000 miles now. I am much happier.

I own this car since around half of its life (23k miles). The original owner told me the car since new consumed oil but never got worse. I'm just wondering if there are any negativ side effects of continued operation with that kind of oil consumption. There are no misfires or any other side effects. With that kind of mileage on engines like the voodoo i'm still pleasantly supprised that without any major refresh + racetrack abuse it still holds up. (:

 

[Markmarkmr]

I have a 2013 scion that consumes unbelievable levels of oil. It would put any GT350 to shame... I've read that it was an oring issue that they've been able to diagnose and fix. Mine just keeps running and keeps burning oil. Where the oil goes is the biggest mystery in my life

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