Wear Relationship to Motor Oil Density

[Doug Hillary]

Hi,
my Oh my, sometimes we do chase rabbits up trees

Perhaps this is the next best and rising saga now that the ZnDDP "problems" (in the minds of some) have been bedded down

My word, all those trashed motors from using SM quality lubricants over the last two years.....................

 

[buster]

Fwiw, the latest Mobil 1 5w30 MSDS now has density at .86. The PDS still shows .80. Probably doesn't mean a [censored] thing, although bruce did allude to the fact that maybe you could determine VII/base oil from this info on a very general level.

 

[Steve S]

Is there enough difference in the numbers to make a difference!!! oils are a package . This is trying to find out about something that doesn't make any real difference.

 

[jorton]

Originally Posted By: yannis
" A fluid with a high density has a higher specific heat capacity (with all things being equal) which means it takes longer to store heat."

by RJHUG1 or RHSPECR from Performanceforums and Nissan silvia forums


?
That means it has a higher flash point, and takes longer for fuel to degrade it?

 

[buster]

It does appear that the less VII's used, the higher the density.

I just noticed off the MSDS for Mobil 1 5w30, the pour point is listed as -33F. Doesn't seem right.

 

[Mark888]

Originally Posted By: buster
It does appear that the less VII's used, the higher the density.

I just noticed off the MSDS for Mobil 1 5w30, the pour point is listed as -33F. Doesn't seem right.

There must be different ways of measuring pour point. The product data sheet lists the ASTM D 5949 Pour Point at -48 C, which is -54 F. Maybe the MSDS method is different.

 

[Corvette Owner]

To "boil down" wear to just oil density is absurd to me! The bearing "support" is a complex fluid dynamics model.

 

[Max_Wander]

Originally Posted By: Corvette Owner
To "boil down" wear to just oil density is absurd to me! The bearing "support" is a complex fluid dynamics model.


You're right. Maybe the title should be "oil film strength relationship to oil density"?