Is 5w-20 has better adhesive to metal than 0w-20?

[flash_os]

Is 5w-20 has better adhesive to metal than 0w-20 in cold weather?

Since 0w-20 has lower thickness on cold weather thus less adhesive when you left your car for a night more oil will be in oil pan.

Somebody tried to test it on any car scrap metal in your garage environment?

 

[MolaKule]

Originally Posted By: flash_os
Is 5w-20 has [have] better adhesive to metal than 0w-20 in cold weather?



No.

There are additives added to motor oils to prevent metal contact on startup, and those additives are deposited on the metals even after drain-off.

 

[T4RF]

Man there is so much distrust of 0W oil on this forum! I remember when synthetics really started breaking into the mainstream, and I heard much of the same “can’t protect as well as REAL oil, hurts all your seals and makes your engine leak!”

 

[mightymousetech]

+1!

There is no such thing as too thin when cold.

 

[PeterPolyol]

It's a matter of the 'polarity' of the molecules; how much they stick to parts, so the chemical formulation of the oil makes the difference rather than the viscosity rating. Like Molakule said, they pay attention to polarity and solubility and tailor the products accordingly, regardless of viscosity.

 

[PandaBear]

Look at it this way, eventually oil cling to metal (cylinder wall and bearing) will all drain down to the sump over night. So it is better to have a thinner oil that can pump to where you want, than thicker oil that will eventually drip down no matter what.

 

[Linctex]

Originally Posted By: PandaBear
Look at it this way, eventually oil cling to metal (cylinder wall and bearing) will all drain down to the sump over night.


You should disassemble an engine that hasn't run for several years...

it will surprise you how much oil DID NOT run down..... over the course of years.

 

[Bryanccfshr]

Originally Posted By: PandaBear
Look at it this way, eventually oil cling to metal (cylinder wall and bearing) will all drain down to the sump over night. So it is better to have a thinner oil that can pump to where you want, than thicker oil that will eventually drip down no matter what.


That’s not how it works, that’s not how any of this works!

 

[jtfmdyk]

When you shut down the oil is warm and 5w-20 should equal 0w-20. By the time things would have cooled enough to cause a difference in viscosity any oil that would drain from internals has long since done so.

 

[FCD]

Originally Posted By: flash_os
Is 5w-20 has better adhesive to metal than 0w-20 in cold weather?

Since 0w-20 has lower thickness on cold weather thus less adhesive when you left your car for a night more oil will be in oil pan.

Somebody tried to test it on any car scrap metal in your garage environment?

Oil never fully drains down, not even the thinnest synthethic 0W-20 or 0W-16, there is always a film of oil left, that is enough to lubricate the engine for the first few seconds of running until the oil has flowed everywhere.
The one and only time in an engine's life that there is a true "dry" start would be the first time the engine is ever run after being put together, or after a rebuild, although every engine rebuilder i know uses plenty of oil and grease on bearings and such when putting together an engine, and they prime it up first before starting it.
Some oils have greater polarity, meaning they wll "cling" a little more to metal than others after shut off.
Conventional oils, specially something thick like a Group I 20W-50 loaded with sticky VII's "sticks" more to metal than say a Group IV PAO synthetic, they drain off faster.

 

[SR5]

Castrol Magnatec

 

[flash_os]

Let check the facts...
Somebody tried to make experiment on scrap metal?

 

[Shannow]

Originally Posted By: flash_os
Let check the facts...
Somebody tried to make experiment on scrap metal?


Plenty of us have checked the facts...pulled apart engines, and the pistons and bearings are full of oil. Held there by capillary action, regardless of viscosity.