Castrol Australia website different from USA

[LexusToyotanut]

Castrol Australia tells me to run 5w40 in my 1994 ls400 ucf10 platform. Meanwhile everywhere and everything in the USA says 5w30. Why shouldn’t i run 5w40 in the summer time? Where I live it gets blistering hot in the summer. I FEEL like 40wt would provide better protection despite 30wt doing well. I also run my engine hard too. I feel like castrol Australia telling me I can run 40wt is enough evidence that I can run it in my 5w30 specd ls400 1uzfe v8. I’m aware 5w30 does just fine but do you think it’s fine if I run 40wt?

 

[kschachn]

There must be at least two hundred threads on this topic and the related subject of other country oil recommendations. Perhaps search those out before starting yet another “thick vs. thin” thread.

 

[Astro14]

Yep. It’s fine. That horse has been so throughly beaten on these pages, I’m surprised you would even bring it up. There are literally hundreds of threads on this topic.

 

[JMJNet]

The answer is "climate" specifically max ambient temperature especially in OZ.

 

[Astro14]

The answer is "climate" specifically max ambient temperature especially in OZ.

There are places in the USA that equal even the climatic extremes of Australian outback.

 

[Brian123]

Castrol Australia tells me to run 5w40 in my 1994 ls400 ucf10 platform. Meanwhile everywhere and everything in the USA says 5w30. Why shouldn’t i run 5w40 in the summer time? Where I live it gets blistering hot in the summer. I FEEL like 40wt would provide better protection despite 30wt doing well. I also run my engine hard too. I feel like castrol Australia telling me I can run 40wt is enough evidence that I can run it in my 5w30 specd ls400 1uzfe v8. I’m aware 5w30 does just fine but do you think it’s fine if I run 40wt?

Are you in Australia or the good old U.S.A.?

 

[JMJNet]

There are places in the USA that equal even the climatic extremes of Australian outback.

There are but for the most part, it is not.

Part of OZ is like Mojave dessert.

Also, another factor is government.
Most of the oil viscosity requirement are mostly to satisfy fuel mpg.

FWIW, I have put 10w-40 in TX for heat for my former 2000 camry without issue.
For newer car, I probably would not do it.

OP is talking about good old Lexus LS400.

 

[JMJNet]

Are you in Australia or the good old U.S.A.?

I am originally from Indonesia.
They require thicker oil there for Toyota.
My dad have been a Toyota owners since the 70's.

 

[Astro14]

There are but for the most part, it is not.

Part of OZ is like Mojave dessert.

Also, another factor is government.
Most of the oil viscosity requirement are mostly to satisfy fuel mpg.

FWIW, I have put 10w-40 in TX for heat for my former 2000 camry.

And so it begins - the "thick vs. thin", "it's all the fault of CAFE", and all while the OP has yet to clarify their operating conditions or location.

 

[4WD]

I am originally from Indonesia.
They require thicker oil there for Toyota.
My dad have been a Toyota owners since the 70's.

Run the 40, Pak

 

[Kira]

My skull is thick, my skin is thin. No debate.

 

[LexusToyotanut]

Are you in Australia or the good old U.S.A.?

I’m in the USA, but it doesn’t matter, all that matters is ambient temp

 

[SubieRubyRoo]

Castrol Australia tells me to run 5w40 in my 1994 ls400 ucf10 platform. Meanwhile everywhere and everything in the USA says 5w30. Why shouldn’t i run 5w40 in the summer time? Where I live it gets blistering hot in the summer. I FEEL like 40wt would provide better protection despite 30wt doing well. I also run my engine hard too. I feel like castrol Australia telling me I can run 40wt is enough evidence that I can run it in my 5w30 specd ls400 1uzfe v8. I’m aware 5w30 does just fine but do you think it’s fine if I run 40wt?

Engines don’t care about your feelings. Sorry, it’s true.

 

[SubieRubyRoo]

I am originally from Indonesia.
They require recommend thicker oil there for Toyota.
My dad have been a Toyota owners since the 70's.

FIFY.

 

[kschachn]

As far as an actual answer goes, no engine is harmed by an oil with a somewhat higher HT/HS as long as the winter rating is appropriate for the expected starting temperature. However, an engine can be harmed by an oil that for whatever reason provides an insufficient MOFT.

And it's not really about ambient temperature it is the temperature of the oil that matters. Vehicles with oil coolers that operate on low-viscosity oils have shown this.

 

[Brian123]

I am originally from Indonesia.
They require thicker oil there for Toyota.
My dad have been a Toyota owners since the 70's.

You are not LexusToyotanut, that is who I asked the question 2!

 

[LexusToyotanut]

Engines don’t care about your feelings. Sorry, it’s true.

yes that’s why I capitalized feel… and I’m literally asking for facts that’s the whole point of my post, I’m asking a question. Jeez

 

[LexusToyotanut]

As far as an actual answer goes, no engine is harmed by an oil with a somewhat higher HT/HS as long as the winter rating is appropriate for the expected starting temperature. However, an engine can be harmed by an oil that for whatever reason provides an insufficient MOFT.

And it's not really about ambient temperature it is the temperature of the oil that matters. Vehicles with oil coolers that operate on low-viscosity oils have shown this.

Thanks

 

[LexusToyotanut]

Yep. It’s fine. That horse has been so throughly beaten on these pages, I’m surprised you would even bring it up. There are literally hundreds of threads on this topic.

Not for my particular application…… actually there are zero threads on my application with the topic at hand