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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...

You’re still arguing “acceptable range,” while I’m addressing claims of superiority. I’ve never denied Toyota allows different viscosities in different markets. In fact, I’ve acknowledged multiple times that the engine is clearly capable of operating across a viscosity range depending on...

Wanting evidence before declaring something “better” isn’t exactly a controversial standard. Also, asking people to support their claims with actual data is not an ad hominem. Calling engineers “bean counters,” calling people cognitively dissonant, and turning the discussion into politics...

This is actually a much better argument than most of the thread because you’ve finally narrowed it down to “margin” instead of trying to claim 0W-20 is outright inadequate. Where I still disagree is the assumption that “more margin” automatically translates into meaningfully better long-term...

And now we’ve officially left the oil discussion and entered political meme territory. For the record, I’m not arguing that manufacturers are infallible. Axle issues, recalls, and spec revisions absolutely happen. The GM bearing example already proved that point. What I am saying is that...