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5w-30
- Thread starter GSPHerder
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Why are you people so resistant to knowledge or ideas? Go waste oxygen some where else and the thread count would be less without the very specific few of you.
If your goal is to have functioning engine for as long as possible, I think the whole thread can be summarized by saying, change your oil more frequently than the manual recommends. Oil weight doesn't matter unless you're on the extreme end of the scale (like I mentioned molasses in this thread or another, apparently the joke wasn't well received - shocking).
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thanks, your replies have been noted and any other replies not data related are not needed or solicited.
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Hey now, some of us are married. I could use some soliciting.
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This bulletin doesn’t prove thicker oil is better.
It proves Toyota considers nearby viscosities acceptable as temporary substitutes during supply shortages.
Big difference.
The specified viscosity is still the baseline recommendation—which is exactly the point I’ve been making.
It proves Toyota considers nearby viscosities acceptable as temporary substitutes during supply shortages.
Big difference.
The specified viscosity is still the baseline recommendation—which is exactly the point I’ve been making.
More dealers, shops and parts stores are being informed about oil supply shortages...with guidance about using suitable substitutions, including mixing viscosity grades and/or going up a grade. They never mention going down viscosity grades tho lol.
Interestingly, when I owned my 2022 Toyota Supra, which obviously was sold by Toyota but built by BMW, Toyota recommend 0w-20 but the exact same engine in the BMW cars recommend 5w-30.
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 economy targets, etc. It’s an entire system, not just “thicker good / thinner bad.”
And the supply shortage bulletins actually reinforce that pretty well. Toyota basically says:
“If the specified oil isn’t available, nearby viscosities are acceptable substitutes.”
That demonstrates flexibility and robustness — not that thicker oil is automatically superior.
Also, “they never recommend going thinner” isn’t really the gotcha you think it is. Going thinner than the baseline recommendation generally reduces viscosity margin faster under heat and load, which is exactly why the baseline exists in the first place.
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.
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