5w-30

[DENNISD]

Can you advise all of us with the different parts+ part numbers for the T24A-FTS engine components that relate to the use of 0w20 engine oil, for the United States, compared to European T24A-FTS engines, which advise 0w20, 5w20, 5w30, and 10w30?
Also, these trucks are assembled in Mexico, engines assembled in the United States.. the same trucks with the same engines for the Mexico market, show the same oil viscosity options as the European engines.. also of note, Toyota indicates that 10w30 can be used from 0 degrees Fahrenheit and above- 10w30. From page 526..
https://www.toyota.mx/content/dam/tmex/pdf-manuals/manual-de-propietarios/tacoma/2024/OM04044S.pdf

Asking for a full parts-number breakdown is a dodge.
The relevant point is simple: Toyota’s U.S. guidance for the Tacoma is 0W-20, with 5W-20 only as a temporary fallback if 0W-20 isn’t available.


Yes, other markets appear to list broader viscosity options for the T24A-FTS. That proves regional recommendations can differ. It does not prove the U.S. engineers “got it wrong,” and it definitely doesn’t prove that randomly going thicker is better.


If someone wants to argue against Toyota’s U.S. spec, they need more than anecdotes and screenshots. They need actual testing. Until then, I’ll follow the spec for the market the truck was built and sold for.

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[32spoke]

Asking for a full parts-number breakdown is a dodge.
The relevant point is simple: Toyota’s U.S. guidance for the Tacoma is 0W-20, with 5W-20 only as a temporary fallback if 0W-20 isn’t available.


Yes, other markets appear to list broader viscosity options for the T24A-FTS. That proves regional recommendations can differ. It does not prove the U.S. engineers “got it wrong,” and it definitely doesn’t prove that randomly going thicker is better.


If someone wants to argue against Toyota’s U.S. spec, they need more than anecdotes and screenshots. They need actual testing. Until then, I’ll follow the spec for the market the truck was built and sold for.

You can’t answer the question, it’s ok..I will do the hard work for you- no parts are different, nor is there any difference,
Just a CAFE rating. The anecdote? Would you like the European oil spec guide as well? These can certainly be introduced into court, what I provided wasn’t anecdotal evidence, but that from Toyota.. no one is arguing that engineers got it wrong, so you don’t need to make this argument. What we are saying that other oil viscosity options are not only allowed by Toyota but also accepted and those oil options that 0w20 cannot.. 0w8, 0w16, and 0w20 are more thermally conductive oils, compared to a 5w30 or a 10w30. Lower viscosity oils also fail at a lower temp when the oil becomes extremely hot.

 

[DENNISD]

You can’t answer the question, it’s ok..I will do the hard work for you- no parts are different, nor is there any difference,
Just a CAFE rating. The anecdote? Would you like the European oil spec guide as well? These can certainly be introduced into court, what I provided wasn’t anecdotal evidence, but that from Toyota.. no one is arguing that engineers got it wrong, so you don’t need to make this argument. What we are saying that other oil viscosity options are not only allowed by Toyota but also accepted and those oil options that 0w20 cannot.. 0w8, 0w16, and 0w20 are more thermally conductive oils, compared to a 5w30 or a 10w30. Lower viscosity oils also fail at a lower temp when the oil becomes extremely hot.

You just proved my point—Toyota allows different viscosities by market, not that thicker oil is better for this engine. The U.S. spec is still 0W-20 (with 5W-20 only as a fallback), and that’s what the engine is certified and designed to run here.


If you want to go thicker, that’s your call—but that’s preference, not proof.

 

[BLtheP]

If you want to go thicker, that’s your call—but that’s preference, not proof.

And how do we provide proof? You already refuted proof.

 

[DENNISD]

And how do we provide proof? You already refuted proof.

I didn’t refute proof—I pointed out that you haven’t actually provided any.


Listing alternative viscosities from other markets isn’t proof of superiority. It just shows Toyota allows different ranges depending on region.


If you’re claiming thicker is better, the burden is on you to show controlled data—not just point to a different page in a different manual.

 

[BLtheP]

I didn’t refute proof—I pointed out that you haven’t actually provided any.


Listing alternative viscosities from other markets isn’t proof of superiority. It just shows Toyota allows different ranges depending on region.


If you’re claiming thicker is better, the burden is on you to show controlled data—not just point to a different page in a different manual.

I’m not talking about the owner’s manual from Mexico, I’m talking about oil analyses that have too many variables and don’t prove anything. So essentially we cannot get what you ask for as far as proof goes, and you will continue to have an unchanged mind.

 

[32spoke]

Same en

You just proved my point—Toyota allows different viscosities by market, not that thicker oil is better for this engine. The U.S. spec is still 0W-20 (with 5W-20 only as a fallback), and that’s what the engine is certified and designed to run here.


If you want to go thicker, that’s your call—but that’s preference, not proof.

Same engine same components,
Only difference is CAFE rating for the United States- different market… lol

 

[DENNISD]

I’m not talking about the owner’s manual from Mexico, I’m talking about oil analyses that have too many variables and don’t prove anything. So essentially we cannot get what you ask for as far as proof goes, and you will continue to have an unchanged mind.

Same engine same components,
Only difference is CAFE rating for the United States- different market… lol

That actually proves my point.


If oil analysis “has too many variables,” then it can’t be used to claim thicker oil is better either—so that argument cancels itself out.


And yes, it’s the same engine, but Toyota still sets different viscosity specs by market. That doesn’t mean every option is equally optimal everywhere—it just means a range is acceptable depending on conditions and requirements.


So unless there’s controlled, repeatable data showing a clear advantage, this comes down to preference.


I’ll stick with the spec Toyota set for this market. If someone wants to go outside that, that’s their choice—but let’s not pretend it’s proven to be better.

 

[BLtheP]

If oil analysis “has too many variables,” then it can’t be used to claim thicker oil is better either—so that argument cancels itself out.

You’re forgetting your own argument earlier on. It was you that refuted oil analyses because you said there are too many variables. So essentially nobody can prove anything to you because you’ve already decided there is no trustworthy data besides “the manual.”

 

[BLtheP]

Same en

Same engine same components,
Only difference is CAFE rating for the United States- different market… lol

We may as well stop. It’s like a brick wall.

 

[DENNISD]

You’re forgetting your own argument earlier on. It was you that refuted oil analyses because you said there are too many variables. So essentially nobody can prove anything to you because you’ve already decided there is no trustworthy data besides “the manual.”

I didn’t reject oil analysis—I rejected it as conclusive proof.


There’s a difference. It shows trends, not controlled outcomes.


That’s why I default to the manufacturer spec—because that is based on controlled testing.

We may as well stop. It’s like a brick wall.

Probably right—without controlled data, we’re just repeating opinions at this point.


I’ll stick with what’s actually been validated for the vehicle.

 

[maxx075]

You guys still arguing about this?

 

[DENNISD]

You guys still arguing about this?

No

 

[coldtaco]

the motor oil geek in a few of his video's tested the Penzoil Ultra Premium Plus ( I think) synthetic and it came out on top when tested to other oils, in most if not all of the metrics that matter.

 

[rijc99]

It’ll be interesting to see how this case turns out

https://www.autoblog.com/news/valvoline-sued-after-using-the-wrong-oil-in-customers-engine

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