Group III synthetic oil volatility in a 2018 5.0L F-150

Messages
4,632
Location
Decatur AL USA
I have a 2018 F-150 with a 5.0L engine with GDI and PFI fuel delivery. I currently have Mobil 5w20 extended mileage synthetic in it. It has 29,000 miles. This oil has 3,500 miles on it and is a quart low. I previously had Valvoline 5w20 synthetic in it with same problem but don't remember the mileage at which I added oil. I do not run this pickup hard. It's mostly a grocery hauler. The temperature gauge runs normal. With the reading I have done, I'm leaning towards an oil volatility problem. Would a PAO Group IV oil solve the problem. I have a problem finding oil volatility readings on different brands of oil in the Group III oils. Also with this engine having partial GDI fuel delivery along with PFI, is there a problem with carbon buildup on valves.

Oil usage is very common in the 2018+ 5.0 GDI. Out of three close friends with them they all consumed more than yours.
 
Messages
2,595
Location
MN
and they would swear to that in court?
Why does it matter, we aren't in court. I guess I have no reason not to believe them yet, so we will see. They have backed me so far so I'm not complaining. Just hope the new engine is not a dud.
 
Messages
5,375
Location
down in the park
As an ex delaer tech I know they would say something like that, A so the product they sold or sell doesn't look bad and B, so you won't have a bad feeling about your car. They definitely won't say "here's number 1001, guys"
 
Messages
15,873
Location
N.H, U.S.A.
I have a 2018 F-150 with a 5.0L engine with GDI and PFI fuel delivery. I currently have Mobil 5w20 extended mileage synthetic in it. It has 29,000 miles. This oil has 3,500 miles on it and is a quart low. I previously had Valvoline 5w20 synthetic in it with same problem but don't remember the mileage at which I added oil. I do not run this pickup hard. It's mostly a grocery hauler. ...
Wow, you must haul load of groceries! :)

#1 You've got exercise the thing. I do understand there may be few opportunities. Problem with all these "Race Tuned" engines on the street with high RPM, excessive and unneeded power, they never get run on their upper torque peak except for a couple seconds in rare occassions. Who wants to suck down gallons of gas for no good reason?

#2 There exist no "Volatility" problem in Passenger car motor oils. This is internet promoted frenzy blather - as usual.

Since FORD dropped the ball, ask them for a FORD Godzilla Big block pushrod engine replacement :)
I FORD was smart they would de- bore this engine to around 6 litres and make it the base V8.

I'm sure they will take care of you. I hope you have a good Service Mgr and good mechanics at your dealer.

- Ken
 
Messages
453
Is it still a cost savings to the manufacturer if they push out faulty products instead of putting more money and effort into making them not faulty to begin with? At what point do they loose a bunch of money dropping new engines into vehicles before they even hit 20K on the odometer? I can imagine they can only push back on fixing their own mistakes so much by doing the old, "you're checking your dipstick wrong"

I know a few engineers who all complain about the bean counters having too much say in pushing out knowingly faulty designs, which in many cases comes back to bite the company in the keester. What's scary, is that some of them work in aerospace, but on non flight-critical parts, thankfully.
 
Messages
790
Location
Kansas
So, the magic dip stick dident repair the oil consumption.
That was never meant to fix the problem, just show a wider operating range. They hold 9 qts, so you aren't going to blow up with 7.
This. And make it longer that you'd need to add oil due to consumption.

"With 7-8 qts, I had to add oil every week!"

"With 9qts, I only have to add oil every month!"
 
Messages
2,595
Location
MN
This. And make it longer that you'd need to add oil due to consumption.

"With 7-8 qts, I had to add oil every week!"

"With 9qts, I only have to add oil every month!"
No. They have always and still hold 9 quarts. With the new dipstick they say it can operate safely down to the add mark at 7 qts instead 8 with the old dipstick. They didn't change oil capacity, the full mark is still 9 quarts.
 
Messages
790
Location
Kansas
No. They have always and still hold 9 quarts. With the new dipstick they say it can operate safely down to the add mark at 7 qts instead 8 with the old dipstick. They didn't change oil capacity, the full mark is still 9 quarts.
it was tongue in cheek, making fun of Ford for their dumbassery
 
Top