Ford 7.3L Godzilla Oil Question

[facility1]

0w-30 Amsoil year-round would be a choice.

 

[JustinSL]

To add to this my work truck , which isn't a 7.3 it's a '23 F250 with the 6.8L but the engine went down in it with 60k miles on it. Lifter failure and lost 3 cylinders had low compression. 5w30 semi synthetic was used every 5-7k usually Napa or motorcraft with a motorcraft filter. It is used off-road , idled a lot , towed with nearly everyday and doesn't get shut off from 5 am till 6 PM most days. Is recommend a good full synthetic in a 10w30 or 40. If used hard. Otherwise just a full syn. 5-30

 

[Shrike9]

Talked to the service writer at the mobil 1 oil change place & he recommended the 5w30 truck and suv oil over the European oil for the 7.3 gasser

but the 5w40 truck & suv would be good for summer severe duty

 

[MMB]

We had 12 when i left and had cam delamination in the mid-60k to upper-80k miles. Ford did a long block on the first one, we paid labor, but denied subsequent warranty work on the rest. They were e450s, 2021 and 2022 year models. I am not sure if the 2023s and 24s have had the problems, don't work there anymore. Now granted these vehicles were on the road 24/7 with most seeing 40k+ miles per year and not driven gently.

Did these vehicles have extended idle time? I believe I read that extended idling was a cause in this delamination problem.

 

[wlk]

Did these vehicles have extended idle time? I believe I read that extended idling was a cause in this delamination problem.

Lots, they were ambulances

 

[OVERKILL]

Did these vehicles have extended idle time? I believe I read that extended idling was a cause in this delamination problem.

That's a theory, but I think its misplaced or not adequately thought through.

Just like oil doesn't age in miles, parts don't wear in miles either. So if you've got a defective patch of heat treatment, it's going to fail after X number of cycles. Now, let's say that this # of cycles occurs at around 10,000hrs, a vehicle that spends a great deal of its life stationary which has say an average speed of 5mph, is going to see this happen at around 50,000 miles, while a vehicle that spends a significant part of its life on the highway, with say an average speed of 35mph, would reach the same # of engine hours at 350,000 miles.

The average lifetime speed of my wife's truck is 30km/h (~19Mph), and it spends a good deal of its life running around.

Now of course RPM also would play a role in the cycling of the pressure and friction on the component, and this isn't captured in engine hours or miles, but hours is certainly a better proxy for cycle fatigue due to the presence of defect than miles.