Mobil 0w40 for my 7.3L ?

Joined
Jul 11, 2021
Messages
1,000
I have a 2020 F350 with a 7.3L gas motor. It has 110k Miles on it, 4900 engine hours with 2900 of them idling.
I've been using Kirkland 5w30 with 200hr OCI since new other than the first few OCI.

I've been thinking about going to Mobil 1 0w40 for awhile and today I noticed its on sale for $37CAD per 5L which isn't as good as Kirkland( I stock up when on sale for $40CAD for 2 x 5L) but is still a decent choice.

So, would the Mobil 0w40 be a good choice for my 7.3L gas? It doesn't get worked very hard but does idle a lot as you can see.

Thanks.
 
My sister has this truck/engine with a Northern Lite camper. Still on dealership free oil changes but once out of warranty I think M1 0W40 is ideal.
M1 FS 0w40 answers just about any possible question for anyone who wants to buy oil while grocery shopping at WM. The end.

It really is that simple. And I’m not even an M1 fan.
 
I have a 2020 F350 with a 7.3L gas motor. It has 110k Miles on it, 4900 engine hours with 2900 of them idling.
I've been using Kirkland 5w30 with 200hr OCI since new other than the first few OCI.

I've been thinking about going to Mobil 1 0w40 for awhile and today I noticed its on sale for $37CAD per 5L which isn't as good as Kirkland( I stock up when on sale for $40CAD for 2 x 5L) but is still a decent choice.

So, would the Mobil 0w40 be a good choice for my 7.3L gas? It doesn't get worked very hard but does idle a lot as you can see.

Thanks.
It has the strictest approvals, and it is entry track oil for Mobil1.
I was pushing 300f on track with it in BMW and still did 5,000mls OCI's.
 
No it isn’t. Mobil 1 0W-40 is a better oil all day long. A cheap spectrographic analysis isn’t going to show that.
With his style of use and sump size it may be overkill to pay almost double what he’s paying for with Kirkland. The recommended oil by ford is a syn blend so a group III oil like Kirkland is already better than what the mfg recommends.

I don’t agree that a spectrographic analysis is useless in his case. He can see how wear numbers compare between the two oils during a snapshot of time
 
I don’t agree that a spectrographic analysis is useless in his case. He can see how wear numbers compare between the two oils during a snapshot of time
That's not the purpose of UOA's, they are not meant to be used comparatively, they are designed to inform the condition of the lubricant for continued service and alert to any potential contamination or mechanical issues with the equipment. They are not a precision wear monitoring mechanism with the ability to discern actual wear performance between lubricants.
 
Would 0w40 perform any better than the kirkland in YOUR engine, who knows?

Proof is in the pudding, not opinions. I would think you would need to compare data.

What tests would be superior to a spectrographic analysis that is obtainable by joe blow?

Will you get twice the miles before a failure, probably not.
 
That's not the purpose of UOA's, they are not meant to be used comparatively, they are designed to inform the condition of the lubricant for continued service and alert to any potential contamination or mechanical issues with the equipment. They are not a precision wear monitoring mechanism with the ability to discern actual wear performance between lubricants.
Then he could use a UOA to see if Kirkland is sufficient for his use case, right? Instead of blowing double the money on every single oil change with Mobil 1
 
Would 0w40 perform any better than the kirkland in YOUR engine, who knows?

Proof is in the pudding, not opinions. I would think you would need to compare data.

What tests would be superior to a spectrographic analysis that is obtainable by joe blow?

Will you get twice the miles before a failure, probably not.
Indeed, the proof is in the pudding, which in this case is an arms-long list of manufacturer approvals for M1 0W-40 that the product has passed the requirements for.

Without actual tear-down testing, that's the data we have access to. Trying to use UOA's is like asking Ms. Cleo.
 
Would 0w40 perform any better than the kirkland in YOUR engine, who knows?

Proof is in the pudding, not opinions. I would think you would need to compare data.

What tests would be superior to a spectrographic analysis that is obtainable by joe blow?

Will you get twice the miles before a failure, probably not.
Exactly. The new trend here seems to be people 💩ing on UOA data. What other data do we go off of then? Do we tear down our engines and inspect every single part for wear?
 
Then he could use a UOA to see if Kirkland is sufficient for his use case, right? Instead of blowing double the money on every single oil change with Mobil 1
If the Kirkland product meets the performance requirements of the application, it's fine to use. UOA would be good (OIA/Polaris) to monitor for fuel dilution, viscosity loss, contamination and other potential areas of concern. That said, you can pretty regularly find M1 0W-40 on sale at a considerable discount, so I'm not sure how much of a price difference there really is in the end for a prudent shopper.
 
Exactly. The new trend here seems to be people 💩ing on UOA data. What other data do we go off of then? Do we tear down our engines and inspect every single part for wear?
It's not a new trend, it's actually a pretty old trend. Pushback was needed because people were trying to draw impossible conclusions from minute variances in PPM on UOA's; determining the "best" oil from these exercises, which simply isn't possible. That's why Doug Hillary took the time years ago to write the Used Oil Analysis article that's on the main page:
 
If the Kirkland product meets the performance requirements of the application, it's fine to use. UOA would be good (OIA/Polaris) to monitor for fuel dilution, viscosity loss, contamination and other potential areas of concern. That said, you can pretty regularly find M1 0W-40 on sale at a considerable discount, so I'm not sure how much of a price difference there really is in the end for a prudent shopper.
The OP literally said he gets Kirkland at $20/5 qt vs $37/5 qt for Mobil 1, both on sale. Huge price difference imo especially considering his sump needs two jugs
 
Back
Top