None of the American Toyota manuals pertain to the vehicle. They are all CAFE manuals. Still apples to apples comparison.
At this point Toyota needs its own forum category.
Using 0W-20 in a 2025 Corolla?
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None of the American Toyota manuals pertain to the vehicle. They are all CAFE manuals. Still apples to apples comparison.
At this point Toyota needs its own forum category.
No technical reason then.
Assuming you are not racing the car, or pulling a trailer often, and are not short tripping it much, I would use 0w-8 and change the oil every 4,000-5,000 miles. I would expect you'll get 300k+ miles from that Toyota.
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You okay?
Some of the GM Ecotecs.
Doing fine. Just trying to keep it technical that’s all.
How about Toyotas? The OP is asking speifically about a Toyota.
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That’s how it goes.. I noticed with this forum lots of interjections to de-rail the op’s initial post. But that’s the internet take it with a grain of salt.
I do not recall where it has been demonstrated that there are no differences in engine management in CAL, 50 State Federal or <insert> European, Oceania or APAC countries. Maybe our resident Deutsche ASE master could comment
What difference in ECU software would you expect to require different/specific oil ?
I can't think of any, not for a thinner spec.
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Ah the famous arguments: different ECM programming, different tolerances, different gasoline in other parts of the world for the same engine?
I hope you realize its nonsense, the differences (if any), would be discussed on BITOG long time ago
IN the case of the 1UR-FE and allowing up to 20w-50 all over the world will insisting on 0w-20 in the USA, there is no difference in calibrations or ratings around the world that would be significant enough to insist on a KV100 reduction in the USA that is amounts of half the KV100 tolerated elsewhere.
Australia is hot, but Death Valley is even hotter. Yet Toyota tells Aussies they can run 20w-50 while insisting Americans use 0w-20. And whereas the international manual that allows 20w-50 resembles the guidelines long common (mapping viscosity to temperature ranges), the American manual has a useless graph just showing 0w-20 magically works at every temperature.
Critically, the international manual also highlights that many different viscosities can be used quite satisfactorily: 5w-30, 10w-40, 15w-40, 20w-50.
In other words, the international manual shows that viscosity is a tradeoff and that the engine can accept a fairly wide viscosity range. This is true and valid.
The American manual suggest there is no tradeoff, that there's no possible benefit to thicker oils or thinner oils; nope, 0w-20 is just the magic viscosity that works everywhere equally perfectly for all people all the time.
If anyone knows the basics of engines and has seen manuals older than the last 20 years, he knows the American manual is pure government reg baloney. The physics of tribology haven't changed just because the EPA is mandating higher MPG.
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Since when did the US manual become the manufacturers recommendation?
0W8, 0W12, 0W16, 0W20, 0W30, 0W40. 5 steps all day every day easy
While not the autobahn, there are several highways in NY and NJ where the flow of traffic especially during early rush hour is 100+ and that's high speed enough for me. I have driven 684 early mornings weekends enough to see absolute maximum speed of a wide range of vehicles achieved and held until out of sight. Autobahn speeds are absolutely achieved
Engine design and control has evolved - some may say significantly - "just because EPA is mandating higher MPG." Then you could also mix in low(er) emission - next even throw in an irrational HP marketing "death spiral" into this stew of discontent.
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I have tried many times throughout the past two decades to "bump up a grade" with the expectation to push the margin of safe operation a tad. Many times with unsatisfactory results. The vehicle then did not seem to operate to design intent. Most were small displacement engines in subcompact/compact vehicles.
Yes engine design and control has evolved. But the physics of tribology are stubbornly persistent.
It remains as unassailable fact that the engine designed followed the mandate to use thinner oils. In other words, the thin oil came FIRST and then the engine had to be designed to be more tolerant of the thinner oil.
It is NOT the case that they design the engine with a bunch of wonder tech like GDI and then figure out which oil is best and then go "Eureka, this new 0w-12 just happens to be perfect!"
IN those cases where OEMs just switched to thinner oils willy-nilly on engine that used to run normal viscosities, it didn't go well at all in many instances (Ford did this several times, I'm sure others did as well).
No, the engine program will have as its design requirement from the beginning the oil viscosity. Then the engineers have to throw all the bandaids possible at the engine to make it live. DLC coatings, superfinishing, the tightest practical bearing clearances, gobs of extra add pack enhancements, etc. This is why the add packs in 0w-16 and lighter oils are often quite a bit more robust in terms of moly and boron levels compared to their thicker cousins.
There are two different things going on:
1. Is it OK to run OEM recommended viscosity in US manual.
2. Is it OK to run thicker viscosity as specified in other countries for the same engine.
The answer might be “yes” to both of the questions at the same time.
1. Is it OK to run OEM recommended viscosity in US manual.
2. Is it OK to run thicker viscosity as specified in other countries for the same engine.
The answer might be “yes” to both of the questions at the same time.
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