VII and basestock musings

[Shannow]

the 5W-20 testing and discussions have had me wandering and looking.

http://www.functionalproducts.com/Catalogs/Solid_VII_Products.pdf

was interesting (P4) as it had a comparison between the basestock ISO rating, and the VII requirement to achieve 5W-30, 10W-30, and 10W-40 lubricants (note had disclaimers re detergency adds).

Example 5W-30, 10W-30, and 10W-40 lubricants, start with ISO 22, 32, and 32 oils to begin with, and those with the widest spread use approximately twice the VII of the one in the middle...

http://www.aftonchemical.com/ProductDataSheets/Engine Oil/HiTEC-5751_PDS.pdf (P2)

Has VII percentage (typically) for
5W-30 at 8.0%
10W-30 at 5.8%
10W-40 at 11.8%
15W-40 at 5.5%
20W-50 at 5.5%

Similar ratios, although the first was solid polymer, the latter pre-diluted.

Read with the first reference, there are steps in basestocks, within the grade, to meet the "W" rating.

http://www.aftonchemical.com/ProductDataSheets/Lubricant Components/HiTEC-5710_PDS.pdf
and
http://www.caltex.com.au/FPL PDS/Rando HD.pdf

provide food for thought...(only chose Rando, as Regal doesn't list an ISO 22)

 

[Gabe]

Thanks for the post. It is like sitting through a quick lecture which I find very helpful.

 

[440Magnum]

What struck me is how small the additive percentages are by weight these days. I confess I read the Afton link first, and those percentages are given by volume for pre-diluted, and it looks unnerving to see numbers around 10% for some grades.

But when viewed by weight, less than 1% at the highest, under half a percent for the lower levels, is not so concerning. I'm all for minimizing non-lubricating additives where possible, but to me the take-home is that we don't really need to worry about them nearly as much as we did 30 years ago.

 

[CATERHAM]

Originally Posted By: 440Magnum
I'm all for minimizing non-lubricating additives where possible, but to me the take-home is that we don't really need to worry about them nearly as much as we did 30 years ago.
Polymer VMs are pretty slippery stuff, so yes they are definitely a lubricating additive.
Now if you want to minimize the non-lubricating additives in oil, choose an oil with a low TBN as in some dedicated race oils.

 

[CATERHAM]

Originally Posted By: 440Magnum
I'm all for minimizing non-lubricating additives where possible, but to me the take-home is that we don't really need to worry about them nearly as much as we did 30 years ago.

Polymer VMs are pretty slippery stuff, so yes they are definitely a lubricating additive.
Now if you want to minimize the non-lubricating additives in oil, choose an oil with a low TBN as in some dedicated race oils.

 

[440Magnum]

Originally Posted By: CATERHAM

Now if you want to minimize the non-lubricating additives in oil, choose an oil with a low TBN as in some dedicated race oils.


Shhh. Don't you know that a TBN less than 9 is just useless!

 

[Shannow]

Originally Posted By: Gabe
Thanks for the post. It is like sitting through a quick lecture which I find very helpful.


No probs...I was looking at university 102 after I'd collected the bits and pieces and was pretty shocked at 102.