google or something:
http://www.bobistheoilguy.com/forums/ubbth...&Number=2921982
http://www.pceo.com/chart.html
http://www.oilspecifications.org/articles/...osity-grade.php

i'm done on this subject with you as well, take it to other people.

i sure hope no one buys modern cars now lol
heck, my year 2008+ 4B10 not-so-modern-engine recommends 0w20 so lol.

TkTunG,
Assuming every other parameters of engine oil being equal ,


Scenario A : operating oil temperature of 9x Celsius (say, at engine rpm 2x00 after more than 30 minutes);

Typical xW30 oil operating viscosity is about 11.x centistokes;

Typical xW40 oil operating viscosity is about 15.0 cSt ;


Scenario B : operating oil temperature of 11x Celsius (say, at engine rpm 4000-6500 on PLUS more than x hours of driving );

Typical xW30 oil operating viscosity is about 7.x cSt;

Typical xW40 oil operating viscosity is about 9.x cSt;
And tentatively referring to my incomplete research as below:-

a) minimum operating viscosity of engine oil pump of about 10-13 cSt;

b) minimum operating viscosity of plain bearings of about 7-10 cSt;

c) ignoring for now, valve train and piston ring/liner etc  minimum viscosity requirements ,if any;
Under Scenario A at 9x Celsius operating , xW30 would be sufficient in terms of wear protection, and

Under Scenario B at 11x celsius operating , xW40 would be strongly recommended over xW30 in terms of wear protection and fuel economy , if any, is ignored.

Just my 2 sen. sweat.gif


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i sure hope no one buys modern cars now lol
heck, my year 2008+ 4B10 not-so-modern-engine recommends 0w20 so lol.



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QUOTE(zeng @ Jun 29 2015, 09:18 PM)
Provide engineering facts and figures please , for the sake of general readers in YOUR thread ! rclxub.gif 

Grow up , and do NOT rant please. notworthy.gif


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Page 1.
    Period .

And please be more civil into this matter and not drag /involve the general readers. smile.gif

This is what they said

Item(s) in order 362978956 has been canceled (Reason: You may be experiencing a system error on the website. These errors usually occur for a very brief time).

I order the oil via lazada app indeed.

How do we gauge the amount to top up? Let's say if the level is at 1/4 to minimum, what is the amount of oil we should pour? I'm afraid of over top-up above max.

Does it make any difference if the engine is cold or warmed up when measuring the oil level?

Of course now, there is no white smoke. Wear and tear happens slowly, you won't see the white smoke until 10 years of driving. Just that you use thicker oil than recommended, you are making wear and tear faster. Maybe the engine is suppose to last more than 10 years, but you use thicker than recommended oil, maybe your engine will last less than 10 years. Idle the engine for 30 seconds won't help. The engine moved before the oil reach the engine, so that's mean your engine run without oil for the first 2 to 3 seconds, and that will make some scratches inside. The maximum your car can use is 10w30, and you are using 5w40, it's too thick.

https://www.thestar.com.my/news/nation/2020...ang-jaya-godown

becareful guys