Why Do Knowledgeable Folks on Here use 20 wt Oil

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seems like I read somewhere that the majority of engine wear occurs at start up is why the lower (0w) viscosity, pertaining to the start/stop function on newer cars and of course cold starts, instant fluid pumpability is why, and the cafe and related U.S.. gov. standards combined. the protection is achieved by the great work the formulators of the modern oils and the engine manufacture.
Yeah you read that here. It’s not true, the majority of wear occurs during warmup as the engine and the oil warm up and some additives activate.

A better winter rating facilitates cranking and pumpability. It does not reduce wear. Pumpability is a binary in this instance, either it is pumped or it is not due to the possibility of shear gelling in the vicinity of the pump pickup. It’s not “better” or “worse”, if it can be pumped it will.
 
Things I’ve learned so far…

Engineers write the manual.
Engineers chose 20 grade or less oils.
Warranty will be denied if 20 grade isn’t used.
Oil passages are to small.
Bearing clearances are to small.
Bearing “tolerances” are to small. 😂
VVT solenoids are to sensitive.
Oil pumps are specially designed for 20 grade or less.
Engines aren’t blown up on the side of the road so 20 grade must be good.
Trust the engineers.
Trust the manufacturers.
Trust CAFE.
Lifetime fluids must be good too.
Severe service means nothing.
Air temperature means nothing.
Oil temperature means nothing.
Everyone is doing it so it must be good.
I never had a problem so it must be good.
Gaining .00001 mpg is worth it.
It’s cold out so I have to run 20 grade or less.
It’s hot out so I have to run 20 grade or less.
UOA’s prove that 20 grade or less prevent wear just as good.
UOA’s and VOA’s predict oil performance.
Physics don’t matter.
Wear studies don’t matter.
Always follow the manual, unless it’s from another country.
My cousins, dentists, friends, mothers, hair dressers, fathers, gynecologists dog saw it in a LSJR vid!!!
 
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It’s not just on the initial start up but the entire time from the cold start until the oil is up to normal operating temperature. That’s where they say that possibly 75% of engine wear occurs. That’s why I have always been in the habit of driving all of my cars very gently until they are up to temperature.
Thats not necessary the oil then is very very thick. I don't know what the wear mechanism is at that time truthfully.
 
Thats not necessary the oil then is very very thick. I don't know what the wear mechanism is at that time truthfully.
It’s definitely necessary to drive the car gently when the oil is still cold. Just because the oil is thicker at that stage doesn’t mean it’s giving its best protection. The oil needs to be up to operating temperature in order for the engine to have its least amount of wear. A lot of the anti wear additives need to be up to temperature to provide the best level of protection.
 
Things I’ve learned so far…

Engineers write the manual.
Engineers chose 20 grade or less oils.
Warranty will be denied if 20 grade isn’t used.
Oil passages are to small.
Bearing clearances are to small.
Bearing “tolerances” are to small. 😂
VVT solenoids are to sensitive.
Oil pumps are specially designed for 20 grade or less.
Engines aren’t blown up on the side of the road so 20 grade must be good.
Trust the engineers.
Trust the manufacturers.
Trust CAFE.
Lifetime fluids must be good too.
Severe service means nothing.
Air temperature means nothing.
Oil temperature means nothing.
Everyone is doing it so it must be good.
I never had a problem so it must be good.
Gaining .00001 mpg is worth it.
It’s cold out so I have to run 20 grade or less.
It’s hot out so I have to run 20 grade or less.
UOA’s prove that 20 grade or less prevent wear just as good.
UOA’s and VOA’s predict oil performance.
Physics don’t matter.
Wear studies don’t matter.
Always follow the manual, unless it’s from another country.
My cousins, dentists, friends, mothers, hair dressers, fathers, gynecologists dog saw it in a LSJR vid!!!
I also learned...

The oil recommended by your vehicle manufacturer will damage your engine.
 
The warranty on my Mazda is up tomorrow I will be using 5W or 10W-30 after that if not 0W-40.
How is the factory warranty up? Assuming 5Y/60Kmi powertrain.
Your signature says you are at approx. the three year /15k mile marker

If I waited to address the viscosity on my Lease VW turbo the engine would be in a basket.

But no noise = no worries can be a somewhat valid argument ... or owning a NA Honda.
 
I Read the thread.

Today:
Guy buys a new car and starts hand wringing about the oil viscosity, feeling it may be inadequate.

Two years from today: Guy trades new car because he enjoys the "latest and greatest"

Net effect = 0
That is so true! I think the number of people out there who truly keep their cars long enough for the oil choice to be of great concern is pretty small. Maybe 1% of them will actually go beyond 300k.
 
I Read the thread.

Today:
Guy buys a new car and starts hand wringing about the oil viscosity, feeling it may be inadequate.

Two years from today: Guy trades new car because he enjoys the "latest and greatest"

Net effect = 0

Not true that you either use thick or thin, I have no problems using 0w-16 in my Toyota Camry, but turbo GDI Acura gets 5w-30 even though it recommends 0w-20. It all depends on the engine…
 
Not true that you either use thick or thin, I have no problems using 0w-16 in my Toyota Camry, but turbo GDI Acura gets 5w-30 even though it recommends 0w-20. It all depends on the engine…
And the driving habits too. Even if it’s a higher performance engine, if someone is using it just for highway cruising and never goes full throttle then viscosity isn’t as important. So the 80 year old guy who buys a new C8 Corvette ZR1 but only drives it to car shows doesn’t need a higher HTHS oil like the guy who buys a ZR1 and takes it to the track 10 times a year and goes full throttle every chance he gets.
 
I Read the thread.

Today:
Guy buys a new car and starts hand wringing about the oil viscosity, feeling it may be inadequate.

Two years from today: Guy trades new car because he enjoys the "latest and greatest"

Net effect = 0
That's me....
 
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