2022 GT with diesel motor oil???

[robvas]

Are you Siberia?

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[engineermike]

The diesel oils aren't bad. In fact, lots of people seek them out for high performance gas engines due to the higher ZDDP content. Here's how the cold viscosity of the 10w-30 diesel oil stacks up against motorcraft 5w-50:

Looks like the 10w-30 cold flows better than the 5w-50 in all but the most extreme conditions.

The only potential issue here is that the high ZDDP content theoretically could poison the cat converters, but I really doubt this is something you'll ever have to worry with. The phosphorus content is only about 25% higher than ILSAC grade API SP oils you'd typically use, but even that works in your favor in terms of engine protection. And even still, the Phosphorus limit doesn't even apply to the 5w-40s and 50s we commonly use so the Phosphorus content could be, and likely is in line with what many are already using in Coyotes.

 

[ORRadtech]

The diesel oils aren't bad. In fact, lots of people seek them out for high performance gas engines due to the higher ZDDP content. Here's how the cold viscosity of the 10w-30 diesel oil stacks up against motorcraft 5w-50:

Looks like the 10w-30 cold flows better than the 5w-50 in all but the most extreme conditions.

The only potential issue here is that the high ZDDP content theoretically could poison the cat converters, but I really doubt this is something you'll ever have to worry with. The phosphorus content is only about 25% higher than ILSAC grade API SP oils you'd typically use, but even that works in your favor in terms of engine protection. And even still, the Phosphorus limit doesn't even apply to the 5w-40s and 50s we commonly use so the Phosphorus content could be, and likely is in line with what many are already using in Coyotes.

Its been my understanding that the high ZDDP levels are only an issue for the Cats if there is significant blow-by.
And it isn't only the ZDDP, diesel engine oil has a much more robust detergent package. As I said earlier, that engine will probably be cleaner after the next oil change than it has been since it was new.

 

[robvas]

It's not recommended to run a "diesel oil" in a direct injection or high rpm engine for many reasons

https://www.hotrod.com/how-to/diesel-oil-in-gasoline-engine/

 

[btown93]

Most dealerships have bulk oil on "tap" and technicians have access to it from their service bays, usually with multiple types of oil (5w20, 5w30, 10w30 diesel and ATF) The number posted above is the part number for the bulk diesel oil. I think its more likely the parts department billed out the wrong number.

 

[SCP440]

I think its more likely the parts department billed out the wrong number.

That would be my guess that is what happened, the wife got billed for a set of spark plugs on her last car a few years ago, very clever considering it was a diesel.
Years ago putting diesel engine oil in was a good way of giving a petrol engine a good clean because of the higher levels of detergents. It would often silent a noisy hydraulic lifter,

 

[Keeffa]

I would get the oil changed now and let Ford know what they've done. 10w is to thick for cold startup . I run 5w40 but I'm in Australia. I use Penrite oil which I believe is the best we have available.
Dealership's are the same all over the world.
This is why I service mine myself.

 

[WildHorse]

high ZDDP levels

Are pointless with quality modern oils.

 

[ORRadtech]

Are pointless with quality modern oils.

OK?
I was simply replying to engineermike, he mentioned that additive.
Curious though, do you think the OP has made any progress on getting Ford to declare his engine destroyed yet?

 

[WildHorse]

OK?
I was simply replying to engineermike, he mentioned that additive.
Curious though, do you think the OP has made any progress on getting Ford to declare his engine destroyed yet?

How would I know ?
And apologies, didn't mean to quote you, it was more of a generic statement.

 

[engineermike]

For one, zddp does matter still and more is generally better for wear protection. Acea a3/b4 still has a higher zddp concentration and is still a relevant spec. Of course there are tons of nuances.

Many diesel engine oils still carry the api “S” rating, meaning they are suitable for spark ignition/gasoline engines. Delvac 1300 for instance is SN rated, among others.

 

[GregO]

Many diesel engine oils still carry the api “S” rating, meaning they are suitable for spark ignition/gasoline engines. Delvac 1300 for instance is SN rated, among others.

Mike, I noticed in the past year or so that many diesel oils have dropped the API S rating since the introduction of SP. SQ is slated for March 2025 so I'm guessing even more dual rated oils will be removed from the retail markets.

 

[engineermike]

Mike, I noticed in the past year or so that many diesel oils have dropped the API S rating since the introduction of SP. SQ is slated for March 2025 so I'm guessing even more dual rated oils will be removed from the retail markets.

Yea, it appears as though they're phasing the gas ratings out on the diesel oils as the API S ratings become more and more restrictive and hyper-focused on fuel economy, LSPI, and cat protection. They'd be sacrificing desirable diesel oil traits like wear protection to meet a spec they're not even marketed for. Delvac 1300 and Castrol turbodiesel appear to still be SN, which is a step and a half behind the latest API spec. Many ACEA oils are also rated for both gas and diesel engines.

Another good performance gas engine oil is Castrol 5W-30 A3/B4 and it only carries the older API SL due to its ZDDP content being too high for SM through P. Interestingly, the Castrol 5W-40 A3/B4 is SP, not because it has less ZDDP, but because the SP ZDDP limit doesn't apply to 5W-40 or heavier.

The point is, don't assume since it's a diesel engine that it's bad for a gas engine because many of them are rated for both and the differences are fairly obscure and inconsequential for most users.

 

[GregO]

The point is, don't assume since it's a diesel engine that it's bad for a gas engine because many of them are rated for both and the differences are fairly obscure and inconsequential for most users.

Case in point, Rotella T6 5W-40 has for decades been a crowd favorite for the wet clutch superbike guys and also as a gas engine oil. Only recently has the gas rating and wet clutch compatible rating been removed from the Rotella bottle label.

 

[engineermike]

Case in point, Rotella T6 5W-40 has for decades been a crowd favorite for the wet clutch superbike guys and also as a gas engine oil. Only recently has the gas rating and wet clutch compatible rating been removed from the Rotella bottle label.

I was actually bummed when they removed the S rating from rotella, so I stocked up on the old version. I do think current T6 still carries JASO MA ratings so you could technically interpret that as a gas engine approval as well.

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