Castrol Edge EP Viscosity Index

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Does anyone find the Vicosity Index of Castrol Edge EP odd?

http://msdspds.castrol.com/bpglis/FusionPDS.nsf/Files/6BD5DE4872AB5E8B80257E7D006877B9/$File/BPXE-9C77UN.pdf

0W20 VI 161

5W20 VI 161

5W30 VI 166

10W30 VI 172

Cant say Ive seen that before. 0w20 and 5W20 with the same VI and 10W30 with a higher VI than 5W30.
 
It's odd... but same with Mobil 1 0W30 and 5W30.

the VI doesn't give a great depth of insight into "W" performance, and neither does "W" performance give a great deal of insight into VI.

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e.g. two 144 VI base oils one could be 0W, the other (I think) 15W.
 
Castrol Edge Extended Perfomance

0W-20 5W-20 5W-30 10W-30
Viscosity @ 100 C, cSt 8.7 8.9 10.8 11.4
Viscosity @ 40 C, cSt 45.1 49.9 62.4 64.8
Viscosity index 161 161 166 172

Their 10W-30 is a lot thicker than their 5W-30 and their 5W-20 is a little thicker than their 0W-20. This explains the viscosity indexes.

It also implies that Castrol EP 5W-20 and 10W-30 may contain more viscosity-index improvers than typical for those grades.

Also, with PAO base oils, viscosity index will be lower because you can start with a thicker base oil to achieve cold-start performance, not requiring as much viscosity-index improvers to thicken the oil when hot. This is the case with M1 AFE 0W-30 that has more PAO than M1 5W-30.
 
That KV100 of 11.4 for the 10W30 is up there. Is it an ILSAC oil?

Kendall GT-1 10W30 has a KV100 of 10.4 (ILSAC)
Delo 400 XLE 10W30 has a KV100 of 11.6 (CJ-4 HDEO)

The Oz Edge 10W30 has a KV100 of 10.5 and a KV40 of 66 (ILSAC)
 
Originally Posted By: SR5
That KV100 of 11.4 for the 10W30 is up there. Is it an ILSAC oil?

Kendall GT-1 10W30 has a KV100 of 10.4 (ILSAC)
Delo 400 XLE 10W30 has a KV100 of 11.6 (CJ-4 HDEO)

The Oz Edge 10W30 has a KV100 of 10.5 and a KV40 of 66 (ILSAC)



Yes, its GF5.
 
Yes, very interesting, I found this PDS
(US) EDGE 10W-30

The US Castrol Edge 10W-30 (not sure if EP or not) is SN, GF-5, A1/B1, MS 6395
KV100 = 11.3
KV 40 = 71.5
PP = - 39C
VI = 151
Noack = 8.5
HTHS = 3.2

That's a nice low Noack and a nice high HTHS for a GF-5 oil.
 
Originally Posted By: SR5
Yes, very interesting, I found this PDS
(US) EDGE 10W-30

The US Castrol Edge 10W-30 (not sure if EP or not) is SN, GF-5, A1/B1, MS 6395
KV100 = 11.3
KV 40 = 71.5
PP = - 39C
VI = 151
Noack = 8.5
HTHS = 3.2

That's a nice low Noack and a nice high HTHS for a GF-5 oil.


Thats the standard Edge (Black Bottle). The Edge Extended Performance (Gold Bottle) is on the same page but unfortunately doesnt list NOACK and only list minimum HTHS for API Grade.
 
Originally Posted By: dailydriver
Originally Posted By: Merkava_4
Which is better: A high viscosity index number or a low viscosity index number ?

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All else BEING EQUAL, higher Viscosity Index is better...higher viscosity index means that the oils are "less wrong" at other temperatures.

All things AREN'T equal, so in the real world, a higher viscosity index usually comes with a lighter basestock, and more Viscosity Modifying polymers, which (typically) provide poorer volatility and deposit resistance, and have a greater ability to shear in service.

No manufacturer has ever specified, and the API and ACEA have never specified Viscosity Index as a measure in a perfromance specification...and as the OP has demonstrated, speccing "0W", "5W", or "10" is NOT defacto speccing a Viscosity Index in spite of posits to the contrary.
 
I would speculate these 4 oils have 3 base oil types of varying natural KV@100*C and thus varying natural VI's.
Let's say there are classified into :
a)low type ,thinner viscosity ;
b)intermediate type, thick viscosity; and
c)high type, even thicker viscosity of all 3 types, in ascending orders.

Intermediate type base oils is being used in 5W20 and 5W30 , whereby 5W30 has bigger quantity in ppm of VII's than 5W20 ....
hence higher Hths of say,exactly 2.9cP for 5W30 with marginally higher VI reading; and say Hths 2.75cP for 5W20 with lower VI reading against 5W30, but higher Hths against 0W20.

Low type base oil is used in 0W20 with VII(of either lesser or bigger ppm than 5W20)to achieve Hths of say,exactly 2.6cP ....... which is marginally Hths lower than 5W20 of say, 2.75cP.

Lastly high type base oil is being in 10W30 with VII (of either lesser or bigger ppm than 5W30)achieving Hths varying from a minimum of 2.9 cp to higher values of say 3.x cP, depending on base oil viscosity grade and quality and quantity of VII's being used.

Confusing...... isn't it?
That's cos the question is open-ended.
No flaming please....
crazy2.gif
 
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