Oil viscosity

[mrtanbg]

For new cars, they normally would use oil viscosity weighted say w30, but for older cars and higher mileage vehicles, they tend to use w50, to protect the engine.
Would this not be a double whammy as the old vehicle already has poor efficiency , poorer mileage and now you go and use a more viscous oil ?
Your opinions please. Thank you.

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[Asure7]

How old is old.
I use W40 since day 1 and now into 9th year still the same.

There is no need for thicker oil unless engine is burning it or u find yourself frequently topping up engine oil.
This usually will not happen with proper maintenance.
In any case, you have the choice of engine overhaul or just using thicker oil (if oil burn/leak is not too serious), whichever more economically viable.

 

[Stallone]

been using W40 all the way

no issues

 

[mrtanbg]

Thank you all.
No issues with engine jiak oil.
My workshop uses w50. Maybe I should bring my own...

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[seowbin]

My car 12+ years

I still using w30 or w40

It's a turbo kar....

 

[Sammiegirl00]

And I thought my mind will be much clearer once I leave edmw. *bow head low*

 

[EJB]

Used w30 all the way.

Now using w20.

 

[snipfer]

Thank you all.
No issues with engine jiak oil.
My workshop uses w50. Maybe I should bring my own...

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This workshop's customers are all circuit racing cars? LOL

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[seanboi]

TS what car you driving? If engine not consuming oil why go for w50?

 

[Sammiegirl00]

Guys. What is this oil viscosity about or for? Passionate driver here just don’t give a toot about maintenance. *smirks*

 

[Blacktoxic]

Use the lowest viscosity shown in the manual. All that talk about a thicker oil for the hot weather is rubbish.

 

[keenklee]

Use the lowest viscosity shown in the manual. All that talk about a thicker oil for the hot weather is rubbish.

It is not all rubbish if one has golden dipstick.

 

[Asure7]

some older cars really need thicker oil to prevent oil burn though.
know a few people overhaul Altis engine and the engine still eats oil.. end up using cheap W50 $22 engine oil before problem went away

 

[andyhtc]

Use the lowest viscosity shown in the manual. All that talk about a thicker oil for the hot weather is rubbish.

Thicker oil is good for those driving long distance or throughout the whole day. The oil will thin out at high temperature and break down more easily over extended use.

 

[keenklee]

Thicker oil is good for those driving long distance or throughout the whole day. The oil will thin out at high temperature and break down more easily over extended use.

The EO should only thin down to the specified viscosity.
Any further, it is not a suitable oil.
No need to use a thicker oil, just get one with high HTHS (High Temperature High Shear) and high TBN. There are quite a few w30 that has high HTHS.
Thicker EO usually gives poorer FC and may increase the overall temperature.

 

[cscs3]

Always stick to manufacturer recommendation. Trust those enginer design your car!

 

[keenklee]

Always stick to manufacturer recommendation. Trust those enginer design your car!

AD might use something different.

 

[Asure7]

Most engines has acceptable range of viscosity for engine oils, and not so particular as to accept only one type. W30 or W40 are both commonly used and accepted. Doesn't make a very big diff.
Sometimes price can play a big part... W40 may be more easily found and economically viable, compared to really high quality W30 that doesn't shear as easily as other w30s.

based on butt-feel alone though... car on w30 feels lighter, while it feels smoother to me on w40

 

[mrtanbg]

I drive an old Toyota Rush , mileage about 600,000km and wife drives an old beemer 318, mileage about 300,000km.
Workshop I visit always use mobil
Anyway what is a good high temp high resistance w30 oil ?

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[Sammiegirl00]

This car viscosity is killing the cat. I’m going to quench the curiosity. Haiz *glares at Trento*