Another oil replacement question...

[Spart]

How can we verify this? I'm currently under ESP until 2031. I'm running Amsoil SS 5w50. Thanks.

It's right there in your GT350 owner's manual supplement.

Again, Amsoil doesn't claim that their 5W-50 meets Ford spec WSS-M2C931-C. They say to use their product in applications that require that spec.

Amsoil words it that way for a reason. If it met the spec, they would actually say that.

And again, this is specifically of concern if you're worried about keeping your warranty. If you aren't:

Good oil. I use it exclusively in my car. Never has tested outside of the window - even when I put 9 hours on one during a long trip to multiple tracks. Oil is analyzed every change and that one came back (safe, but outside the optimal window).

It is not that it's bad, it's that they aren't trying to target any manufacturer requirements at all. Whether those requirements have to do with fuel economy, catalytic converter longevity, emissions, whatever - doesn't matter.

Amsoil is doing their own thing and they don't really care what the various manufacturers are asking for.

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[CorralesR]

Would love to see the 03 Saleen!

 

[honeybadger]

It's right there in your GT350 owner's manual supplement.

Again, Amsoil doesn't claim that their 5W-50 meets Ford spec WSS-M2C931-C. They say to use their product in applications that require that spec.

Amsoil words it that way for a reason. If it met the spec, they would actually say that.

And again, this is specifically of concern if you're worried about keeping your warranty. If you aren't:



It is not that it's bad, it's that they aren't trying to target any manufacturer requirements at all. Whether those requirements have to do with fuel economy, catalytic converter longevity, emissions, whatever - doesn't matter.

Amsoil is doing their own thing and they don't really care what the various manufacturers are asking for.

My guess is they don't need to pay for it. Why pay for a Ford-specific cert if you don't need to to be profitable?

Either way, they do say they meet it - FWIW

In conjunction with this AMSOIL has added a new viscosity to its Signature Series line specifcally formulated for high-horsepower Ford Mustang engines requiring the Ford WSS-M2C931-C performance specification.

https://blog.amsoil.com/amsoil-expa...-5w-50-synthetic-motor-oil-for-ford-mustangs/

It also says it in their data sheets https://amsoilcontent.com/ams/lit/databulletins/g2880.pdf

Regardless - I still think you're good with the vast majority of oils out there as long as you follow the obvious things (viscosity, full synthetic, and it meets the API SN cert). I used Motorcraft in the beginning and it was fine. It did breakdown faster than the racing oils I tested, but that's to be expected.

 

[Sajin]

My guess is they don't need to pay for it. Why pay for a Ford-specific cert if you don't need to to be profitable?

Either way, they do say they meet it - FWIW



https://blog.amsoil.com/amsoil-expa...-5w-50-synthetic-motor-oil-for-ford-mustangs/

It also says it in their data sheets https://amsoilcontent.com/ams/lit/databulletins/g2880.pdf

Regardless - I still think you're good with the vast majority of oils out there as long as you follow the obvious things (viscosity, full synthetic, and it meets the API SN cert). I used Motorcraft in the beginning and it was fine. It did breakdown faster than the racing oils I tested, but that's to be expected.

Yeah, amsoil says they meet it, but API.org says no. Amsoil SS 5w-50 isn't even listed on the API.org website.

 

[honeybadger]

Yeah, amsoil says they meet it, but API.org says no. Amsoil SS 5w-50 isn't even listed on the API.org website.

Looks like most performance brands are left off that list...I only see Penzoil, Exxon, and Castrol (from the big players - lots of lesser-known/used brands).

https://engineoil.api.org/Directory...=10079&viscosities=5W-50&serviceCategories=SN

 

[Sajin]

Looks like most performance brands are left off that list...I only see Penzoil, Exxon, and Castrol (from the big players - lots of lesser-known/used brands).

https://engineoil.api.org/Directory...=10079&viscosities=5W-50&serviceCategories=SN

Yeah. Out of those three only Castrol has one oil that meets the API & Ford certifications... https://www.mlperformanceusa.com/pr...S3TdAEfsjchNgt3bfoF8GkgmqC9kjwgBeybhN7OBUPMz1

https://www.google.com/url?sa=t&sou...sQFnoECCYQAQ&usg=AOvVaw2Kw7PTgvN0Y9OJZW9H4pvu

 

[JAJ]

Before getting too hung up on the Ford spec, this language is lifted from the 2015-2016 GT350 Owners Supplement:

"Your engine has been designed to use engine oil that meets Ford specification or an equivalent engine oil of the recommended viscosity grade that displays the API Certification Mark for gasoline engines."

The Owner's Supplements up to 2020 have the same language or something similar.

As for how many oils have both API and Ford spec compliance, there are actually two. One is the Castrol Supercar oil and the other is Motorcraft 5w-50. Presumably, it's made under contract to Ford by one of the companies on the API website list.

I've used either Motorcraft or Mobil 1 5w-50 in my 2016 GT350 since new, based on whichever one was cheapest when I was shopping for oil, and the the UOA's are all fine. I've switched recently to Mobil 1 Supercar 5w-50, and again the UOA's are good and, oddly enough, the engine actually runs quieter than it did on the other two oils.

As for which oil is best, well maybe back in the 1990's specialty suppliers like Amsoil had a valid point that their oil was better than API SE or SF. These days, to pass any qualification test, the oil's got to be pretty good, and more than "good enough" for pretty much any mass-produced engine. Engine failures from crappy oil just don't seem to happen any more.

 

[Spart]

Either way, they do say they meet it - FWIW

In conjunction with this AMSOIL has added a new viscosity to its Signature Series line specifcally formulated for high-horsepower Ford Mustang engines requiring the Ford WSS-M2C931-C performance specification.

https://blog.amsoil.com/amsoil-expa...-5w-50-synthetic-motor-oil-for-ford-mustangs/

It also says it in their data sheets https://amsoilcontent.com/ams/lit/databulletins/g2880.pdf

Regardless - I still think you're good with the vast majority of oils out there as long as you follow the obvious things (viscosity, full synthetic, and it meets the API SN cert). I used Motorcraft in the beginning and it was fine. It did breakdown faster than the racing oils I tested, but that's to be expected.

Nope, they don't say they meet it. You're quoting the same thing I'm quoting. They never claim to meet the spec. They say "Use AMSOIL Signature Series Synthetic Motor Oil in applications that require" followed by a whole laundry list of specs and approvals which they do not have (including Dexos, which helpfully lists the oils that have approval and Amsoil is notably absent.)

It's weasel wording and Amsoil is infamous for this. If they claimed that they met the specification, Ford would likely take legal action against them. So would API, GM, and others.

They use the exact same wording on the back of the bottle:

As a contrast, here's what Lucas Oil claims about their 5W-50:

SPECIFICATIONS, APPROVALS AND RECOMMENDATIONS:

Meets or exceeds American and European OEM specifications, including API SP/SN/SM/SL, Ford WSS-M2C931-C

Here's what Castrol claims about their 5W-50 Edge Supercar:

Application

Castrol EDGE SUPERCAR 5W-50 is recommended for the FORD GT supercar.

Castrol EDGE SUPERCAR 5W-50 is approved for use in vehicles where the manufacturer requires a product that Meets Ford WSS-M2C931-C.

It has been developed for the FORD GT supercar and is also suitable for use in other performance cars.

Again, I'm not saying that Amsoil is bad. It just isn't. But when it comes specifically to the question of whether their oil is 100% not going to void your warranty - I wouldn't bet a $25k engine replacement on it. You are putting yourself at the mercy of your dealership and Ford.

 

[JAJ]

Nope, they don't say they meet it. You're quoting the same thing I'm quoting. They never claim to meet the spec. They say "Use AMSOIL Signature Series Synthetic Motor Oil in applications that require" followed by a whole laundry list of specs and approvals which they do not have (including Dexos, which helpfully lists the oils that have approval and Amsoil is notably absent.)

It's weasel wording and Amsoil is infamous for this. If they claimed that they met the specification, Ford would likely take legal action against them. So would API, GM, and others.

They use the exact same wording on the back of the bottle:

As a contrast, here's what Lucas Oil claims about their 5W-50:



Here's what Castrol claims about their 5W-50 Edge Supercar:



Again, I'm not saying that Amsoil is bad. It just isn't. But when it comes specifically to the question of whether their oil is 100% not going to void your warranty - I wouldn't bet a $25k engine replacement on it. You are putting yourself at the mercy of your dealership and Ford.

Everybody that uses Amsoil loves it. It gets great reviews. The only problem, as you point out, is the wording around specifications compliance. And the concern that raises is more "what is it they're not telling us" rather than anything concrete. The way I see it is, if it meets the standards, then add a dime to every bottle to cover the cost of getting it tested and certified. If it doesn't meet the standard, then why would I use it? Just because they recommend it? Get a grip.

 

[Spart]

Everybody that uses Amsoil loves it. It gets great reviews. The only problem, as you point out, is the wording around specifications compliance. And the concern that raises is more "what is it they're not telling us" rather than anything concrete. The way I see it is, if it meets the standards, then add a dime to every bottle to cover the cost of getting it tested and certified. If it doesn't meet the standard, then why would I use it?

I love their "Severe Gear" bags of gear oil. Makes it sooooo much easier to fill a diff.

I really hate that they aren't up front about what they're doing regarding whether or not they meet manufacturer and API specifications. It confuses a ton of people, even really smart people in this thread. It's deliberate and it's shady.

 

[Stage_3]

That is STUNNING!!!
Beautiful car. Enjoy.

 

[robvas]

Still waiting for cases of Ford denying warranty because of the oil not being "correct". Just fear mongering.

 

[FlipC]

I apologize in advance. I've read prior threads about people switching over to Amsoil. I've owned my 19 350 for a few years and always used motorcraft oil. Who knows what the previous owner used.

I'm a preferred customer through Amsoil and I'm about to order oil for my 03 cobra. I've ran Amsoil in that car for many years.

I keep going back and forth about it for the 350. It's just shy of 18k miles and I have a Ford ESP until 2030.

I also don't log many miles. Thought about buying some of their oil filters too

Sorry for beating a dead horse. I know it meets Ford's specifications. I guess I'm just looking for confirmation either way.

Thank you!

Here is a Blog this engineer made a few years ago. He has tested over 250 different motor oils over the years and he says the Best one ever is 5-20 Full Synthetic Quaker state. I run it in everything I have. My 20 GT350, 2006GT, 2019 GT, Everything! Read the blog it is interesting and makes sense. MOTOR OIL ENGINEERING TEST DATA | 540 RAT - Tech Facts, NOT Myths (wordpress.com)

 

[Sajin]

Here is a Blog this engineer made a few years ago. He has tested over 250 different motor oils over the years and he says the Best one ever is 5-20 Full Synthetic Quaker state. I run it in everything I have. My 20 GT350, 2006GT, 2019 GT, Everything! Read the blog it is interesting and makes sense. MOTOR OIL ENGINEERING TEST DATA | 540 RAT - Tech Facts, NOT Myths (wordpress.com)

You run a 20w in your GT350 that calls for a 50w? Brave.

 

[FlipC]

You run a 20w in your GT350 that calls for a 50w? Brave.

Actually its Better, runs cooler and is the best High Temp and High pressure resistance oil ever tested. And its inexpensive, I buy a 5quart bottle for $25 at Menard's! it is 5-30w i couldn't remember his blog. Read It!

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