Engine Oil Grade Selection

[saqibhassan95]

There's a theory, increase oil grade with mileage, like when recommended is 0w20, at 50k kms use 5w30 and 100k 10w40
I wasn't able to understand logic behind this, because I've never came across manfacturer recommendation like this, can anyone explain in detail?
Thanks

[Luke_mani]

It's dumb logic. Use oil as recommended by manufacturer. Use original oil for a trouble free car.

[saqibhassan95]

Thanks..

It's dumb logic

I do believe this..

Use oil as recommended by manufacturer. Use original oil for a trouble free car.

Yes still using recommended grade, 0w20

I asked someone regarding this, here is his reply
"the science is
When engine is newer, it's clearance is reletivly small so it need thin oil.
When engine gets old it's clearance starts to increase due to friction and wear and tear, so it need thick oil for lubrication."
When I asked about source or link, his reply
"It's a rule of thumb dear
And a common sense for any person with engineering background"
Then I thought better to ask on forums because I don't trust anyone unless it's recommended by manfacturer

[capsat]

@margallar @babarhyd @rajaatta @dani_kk @haseeb.basharat

@Xulfiqar @VCheng

does any vehicle manufacturer suggest such dumb rule of THUMB ??

[sleeper]

Clearly that person himself is not from engineering background...

Sir, always follow the OEM recommendations

[Xulfiqar]

And a common sense for any person with engineering background"

make sure the person is not a crackhead in disguise, or some wannabee allama (trust me every other person is an allama in Pakistan)

the manufacturer are the best source of service specification materials (oils/fluids etc) for their machinery (car)

[rajaatta]

I think it's time to shift on Mars again.
As the Corona is spreading and the dumb scientist like these are also spreading so we have no room here to live let's go to Mars

️

[VCheng]

Such Rules of Thumb are better applied when not stuck in a bodily orifice, specially when a person is addressing me as "dear".

(I could go on with analogies related to bigger sizes for certain female organs as they grow older, but Hanif Bhai will ban me. Only those who cannot think beyond such matters comes up with such stuff: Innjunn dhila ho gaya? Mota tel pao!". I need not say any more.)

[margallar]

as a person with engineering background, i will say that using a thick oil will cause more harm than good.

If the engine is bad enough to be burning too much oil, then it is time for an overhaul, not using a more viscous oil.

A thick oil will among other things, have a lower flow rate when cold, which is when alot of the wear happens.

if the engine is used on the correct oil with a well maintained cooling system, pcv system and with timely oil changes. you can touch 300,000 km still running on recommended grade oil (and keep going). At this point the car will have pretty much completed it's life and an overhaul will be justified.

If there is minor reduction, it means it is time to top up the oil, not that the engine will explode, if you do not use a viscous oil.

Please also note that a more viscous oil will usually (not always though) be a lower api grade.

[anon35615524]

There's a theory, increase oil grade with mileage, like when recommended is 0w20, at 50k kms use 5w30 and 100k 10w40

I doubt any such proven theory exists!

As long as recommended engine oil grade / viscosity is poured since day 01, genuine and original engine oil is used and drained after regular intervals, genuine / OEM oil filters are used, etc. engine kahien nai janay laga. IN SHA ALLAH.

I believe, engines deteriorate when any / all such factors are not deployed properly and effectively (of course, along with many other factors too).

[babarhyd]

[Xulfiqar]

but - ainjeniyur in Pakistan are considered useless, we can give them examples or prove logic all day long,

but in the end - oils have a special place in all Pakistani peoples minds. You get to see people rub, drink, (even bathe in oil when the old oil filled transformers leaked) - and for some moronic reason the old dada ki vegzall problem is very strong in Pakistan.

people assume that because their grandparents took their piece of trash to a rickety car wash every friday after prayer to be drowned in water and then slathered in some diesel and oil, it must be something that is wise. - While forgetting that their grandparents probably got fooled by morons called mechanics. As these same mechanics would use heavy oils in engines because for them, garam aail patla hojata hai aur piece maar khajainge.

morons never thought anything beyond that. And because Pakistanis suffer from that issue, we get to see these theories.

[TypeA]

This post was flagged by the community and is temporarily hidden.

[dms664]

If the engine is bad enough to be burning too much oil

sir could you define this too much oil, like how much oil burning is considered as normal, then what is much and then too much. looking forward to your kind guidance

[TypeA]

This post was flagged by the community and is temporarily hidden.

[saqibhassan95]

Thanks all
Secondly in Pak, when recommended grade is 0w20, people pour 5w30 or 10w40 because of hot climate
How to tackle with such people, what's the ultimate solution ?
(Other than local mechanics, It's also issue of pak suzuki, where recommended grade for their cars like alto wagonr and cultus is 0w20, they're recommending 10w40, when someone asks to pour 0w20, they say "sir warranty void hojaye gi")

[hash737]

but - ainjeniyur in Pakistan are considered useless, we can give them examples or prove logic all day long,

yes......yes.... YES....exact damn ly....thats what i have been saying...and thats the sort of ainjenyur hired by local automotive assemblers in pakistan...who dont know jack.

[umairjamil6]

There are a lot of such stupid myths. Can we make a list of them and sticky them or something
Examples include: mechanically cleaning the plugs, using diesel to clean the car, using water instead of coolant. One comprehensive thread or blog should be made by Pakwheels so the general public can be educated otherwise the problem wont be solved. I am a mechanical engineer and even I didnt know that this stuff was wrong, because I was never taught about this stuff. We need to spread awareness pls!!!

[dani_kk]

Hahaha first time on earth I've got to know that such type of scientists still exist on this planet... Sounds convincing clearances open up.
In urdu u can say, engine kay bearings kay gap khulay hojatay piston block mein khullay hojatay har cheez dheeli hojati, aur wo gap oil bharta what a joke it is.

[dani_kk]

Few days back, a car from some government department visited us, they were asking me about my engine testing methods, where I answered compression test...
& they were like sir, we went to a guy in Islamabad i10 & when he swapped a engine, we asked him how do u test the engine is good, the reply was pretty convincing

Sir jeee bus pataaa hota hai samjha karen axxxxperienceeee hai & when they again asked him btaye na kaise, he was like plaggg pe ungli rakh kay salaf marengay to ungli pe pressure ka pta lagayga..

& I was like, thug life wala music on hojae and that guy wears the glasses