M1 0w40 thinner at startup than Castrol 0w30

[CharlieBauer]

Interesting to compare the current versions of these two oils.

M1 first

Vis 40: 70.8 vs 73.2
Vis 100: 12.9 vs 12.2
Vis Index: 186 vs 164
HTHS 150: 3.6 vs 3.5
MRV -40: 21,600 vs 20,400

With the MRV so close and M1's high VI and lower Vis 40 it looks like M1 0w40 will be thinner at many start up temperatures.

I wonder where their Viscosity meets.

As we head into the brutal California winter, this could be the difference between our engines surviving or not.

 

[Kuato]

Originally Posted By: CharlieBauer
...

As we head into the brutal California winter ...

 

[userfriendly]

The difference will defiantly be noticeable at temperatures between -37.5F and -46F with easier cold starts and improved fuel economy going to the thinner oil and lower VI.
However, below -46F, the cross-over temperature, advantage favors the high VI engine oil.

Remember, if you wish to plug your block heater in overnight, people with odd number address may plug in on odd number days, and people living in even numbered addresses may plug in on even days, such as the 6th, 8th, 10th etc.

Persons changing their oil before 3,000 miles must save the used oil for future use.
You may not plug your block heater in and flush your toilet both on the same day.

 

[Jetronic]

M1 contains more or higher SSI VII and thinner base oils, is what I get from that...

 

[CharlieBauer]

I calculated the M1 is thinner between -7c and 55c.

 

[SwampSurvivor]

Originally Posted By: Kuato
Originally Posted By: CharlieBauer
...

As we head into the brutal California winter ...

I hear it dropped all the way into the 30s once, back in 1947

 

[53' Stude]

Plus California will never see the -48F as that's M1 0w40 pour point according to Mobil.

 

[BobFout]

Unfortunately we don't know the actual 0w specs of these two oils.

 

[Bryanccfshr]

insualted garages beat viscosity index on any cold morning.

 

[40w8]

Use the Widman vis graph, and find out.

Calculating the viscosity curve

 

[OVERKILL]

Originally Posted By: 40w8
Use the Widman vis graph, and find out.

Calculating the viscosity curve


A visc calc isn't accurate below 0C BTW.

 

[CT8]

Originally Posted By: CharlieBauer
As we head into the brutal California winter, this could be the difference between our engines surviving or not.

In the high elevation mountains and high desert in California a syn 5W would be overkill

 

[CT8]

Originally Posted By: Miller88
Originally Posted By: Kuato
Originally Posted By: CharlieBauer
...

As we head into the brutal California winter ...

I hear it dropped all the way into the 30s once, back in 1947
That's darn near freezing in California.

 

[edyvw]

Originally Posted By: CharlieBauer
Interesting to compare the current versions of these two oils.

M1 first

Vis 40: 70.8 vs 73.2
Vis 100: 12.9 vs 12.2
Vis Index: 186 vs 164
HTHS 150: 3.6 vs 3.5
MRV -40: 21,600 vs 20,400

With the MRV so close and M1's high VI and lower Vis 40 it looks like M1 0w40 will be thinner at many start up temperatures.

I wonder where their Viscosity meets.

As we head into the brutal California winter, this could be the difference between our engines surviving or not.

Unless you run -10W40, I have no idea how you car would survive CA winter.
Not sure about current M1 as I did not run, nor I will, VISOM version at least in my cars had noisier cold start than most 5W oils I ran in temperatures range of 10 to -30.

 

[40w8]

Overkill, I'm not the guy that said down to -7C.

It was CharlieBauer.

Widman graph goes from 0c to 100c, and he got right that 55deg C is the crossover point.

 

[CharlieBauer]

While I was kidding about the California winter, there are places in the state where you should run a 5w oil.

 

[OVERKILL]

Originally Posted By: 40w8
Overkill, I'm not the guy that said down to -7C.

It was CharlieBauer.

Widman graph goes from 0c to 100c, and he got right that 55deg C is the crossover point.


Fair enough. People tend to use it below its range, that's why I pointed it out, I just quoted you because you were the one who linked it, that's all

 

[CT8]

Originally Posted By: CharlieBauer
While I was kidding about the California winter, there are places in the state where you should run a 5w oil.
I noticed the winkie

 

[edyvw]

Originally Posted By: CharlieBauer
While I was kidding about the California winter, there are places in the state where you should run a 5w oil.

Lol, I was joking man.
One thing about Castrol 0W30 is that is has ridiculous pour point of -60, as far as I remember.

 

[CharlieBauer]

^ I knew you were joking!