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Your examples actually reinforce something I think we agree on: these engines appear to be quite tolerant of adjacent viscosities. A Camry making it to over 200,000 miles on a mix of 0W-20, 5W-20, and 5W-30 is impressive, but to me it demonstrates the robustness of the engine more than the...

I'm all for looking at the numbers. That's exactly why I don't think one UOA can answer the question. If one 0W-20 analysis shows elevated wear, there are dozens of possible explanations besides viscosity—engine break-in, driving conditions, contamination, fuel dilution, sampling variation, OCI...

That's a fair point, and I don't think anyone is arguing that 5W-30 is "too thick" for this engine. Toyota itself approves it in other markets. The question isn't whether the engine can run 5W-30—it clearly can. The question is whether switching from the North American recommendation to 5W-30...

I agree that Toyota doesn't present 5W-30 as some catastrophic choice that will immediately damage the engine or void the warranty. The manuals clearly show the engine is capable of operating on a range of viscosities depending on the market. Where I'd make one clarification is your last point...

I agree. I think we've probably reached the point where we're just going in circles. (well, maybe 18 pages ago) :p There seems to be broad agreement that Toyota approves multiple viscosities globally and that 0W-20, 5W-20, and 5W-30 can all be acceptable depending on the market and operating...

I'm not telling anyone what oil they have to use. I've said repeatedly that if someone wants to run 5W-30 or 0W-30 within Toyota's globally approved viscosity range, that's their decision. What I've challenged are the conclusions being drawn from the data. I have no issue with people posting...

The same thing that guides a lot of owner decisions that fall within an acceptable range: risk tolerance. Some people change oil every 5,000 miles instead of 10,000. Some use premium fuel when regular is permitted. Some replace transmissions fluid earlier than the maintenance schedule. Those...

I completely agree that CAFE may influence Toyota's North American viscosity recommendation. I've never argued that fuel economy regulations play no role in these decisions. Where I think we still differ is that proving CAFE influences the recommendation does not automatically prove that 5W-30...

Honestly, this is one of the more rational takes in the thread. You're acknowledging that it's a personal choice based on climate, operating conditions, and your own comfort level rather than claiming Toyota got it wrong. I don't have any issue with that position. Where I've pushed back is...

Because "not required everywhere" and "superior everywhere" are two completely different things. I've never argued that 0W-20 is the only oil this engine can run. In fact, the global Toyota charts clearly show otherwise. What I keep challenging is the assumption that because Toyota permits...

The funny part is that you actually help me prove my point. If we need a controlled dyno test and teardown to know for sure, then we're probably not as certain about 5W-30's superiority as some people in this thread pretend to be.

I'll watch it, but even if the conclusion is correct for a Duramax, that's still a Duramax-specific conclusion. That's actually been my point throughout this thread. The fact that one manufacturer, one engine family, or one application benefits from a different viscosity doesn't automatically...

Nah... I was just dangling some bait for the forum's greatest minds. Looks like it worked. :idea:

I don't think that's a silly stance at all. The V35 issue may have nothing to do with the T24A-FTS mechanically, but it certainly reminds owners that warranty support matters. If someone wants to stay with the specified viscosity until they're out of warranty, that's a perfectly rational...

I currently own 10 vehicles, most of them Toyotas, and I’ve been surprised to find that the dealership is often the least expensive place to buy a battery. On the other hand, for higher-priced parts, I’ve found that ordering online and having them shipped to Omaha is usually cheaper than buying...

If the Supra on 0W-20 were experiencing widespread lubrication-related failures while BMW versions survived on 5W-30, that would be meaningful evidence. But simply having different factory recommendations for the same engine family doesn’t automatically establish superiority one way or the other.

Nobody said 0W-20 is “too thick to fit through passages.” That’s just a caricature of the argument. The point has always been that modern engines are engineered and validated around specific oil characteristics — flow, pressure behavior, film strength, startup performance, VVT operation, fuel...

I think we’re actually closer in position than you realize. I’ve never said people “can’t” run thicker oil. I’ve repeatedly acknowledged the engine is clearly capable of operating across a viscosity range. If someone prefers running 0W-30 or 5W-30 for peace of mind under heavy load or heat...

Because Toyota clearly believes the engine is capable of operating across a range of adjacent viscosities depending on regional priorities, climate assumptions, fuel economy targets, oil availability, and operating expectations. I’ve never disputed that. What I keep disputing is the conclusion...

Some posters absolutely have implied that — either directly or indirectly — by repeatedly framing 0W-20 as a CAFE-driven compromise sitting dangerously close to inadequate. That’s very different from simply saying: “Toyota allows multiple viscosities globally.” I’ve already acknowledged the...