M1 FS 0W40 vs. Castrol Edge 0W40

[OVERKILL]

Is Zn/P 0.11% still in place? TDS for XW-40 was missing for quite some time and still is. I was expecting a change.

It's shown on the Mobil Product Guide:
https://www.mobil.com/lubricants/-/...engine-oils-product-guide-sheet--may-2022.pdf

It shows 1,000ppm phosphorous, 1,100ppm zinc.

 

[Gokhan]

Yeah, that SDS still has a very old KV100 on it (13.8), and it's from earlier in the year. I'm holding out to see they update it again in the next month to match the current PDS.

Do they ever have accurate KV values in MSDSs? They seem to be generic values for that product type.

 

[OVERKILL]

Do they ever have accurate KV values in MSDSs? They seem to be generic values for that product type.

Good point! Thought it was 13.8 at one point in time!

 

[Gokhan]

Good point! Thought it was 13.8 at one point in time!

The HTHS table has the values for the PAO-based SM and Group-III+-Visom-based SN versions.

The Group-III+-Visom-based version is still the best version of M1 0W-40 A3/B4 ever. That Visom Group III+ base stock was an exceptional base stock with a very high viscosity index (VI), better than Shell's GTL base stocks, with a higher VI than theirs.

 

[OVERKILL]

The HTHS table has the values for the PAO-based SM and Group-III+-Visom-based SN versions.

The Group-III+-Visom-based version is still the best version of M1 0W-40 A3/B4 ever. That Visom Group III+ base stock was an exceptional base stock with a very high viscosity index (VI), better than Shell's GTL base stocks, with a higher VI than theirs.

Yes, they do have some fantastic properties:

 

[Gokhan]

Yes, they do have some fantastic properties:
View attachment 124681

ExxonMobil Visom Group III+ base stocks readily beat the ExxonMobil SpectraSyn PAO base stocks in viscosity index (VI), which have VI = 126, 138, and 139 for KV100 = 4.1, 5.8, and 8.0 cSt, respectively. A higher base-oil viscosity index (BO VI) means less viscosity-index improver (VII) and a thicker base oil.

 

[OVERKILL]

ExxonMobil Visom Group III+ base stocks readily beat the ExxonMobil SpectraSyn PAO base stocks in viscosity index (VI), which have VI = 126, 138, and 139 for KV100 = 4.1, 5.8, and 8.0 cSt, respectively. A higher base-oil viscosity index (BO VI) means less viscosity-index improver (VII) and a thicker base oil.

Yup, you have to step up to the SpectraSyn Plus 6 to get a better VI than the VISOM 6cSt which is 143 vs 142.

 

[Link]

If you are looking for a stout A3/B4 XW-40, Pennzoil Platinum 5W-40 A3/B4 SP is the way to go, not these thin 0W-40 oils packed with VII. PP 5W-40 A3/B4 SP is a lot thicker in both HTHS and HTFS than these thin 0W-40 oils. A 0W-40 could be as thin as a 0W-20 in the valvetrain and rings—and even in the bearings at high RPMs—so, be warned. There are actually 0W-20 oils that are thicker than these 0W-40 oils in those areas and situations. More VII means a thinner base oil because otherwise the oil will not the pass the low-temperature pumping viscosity (MRV) test.

But don’t the 0w-xx counterparts usually have better base oils? How would you compare say Castrol euro 0w40 up against PP euro 5w40?

 

[Gokhan]

But don’t the 0w-xx counterparts usually have better base oils? How would you compare say Castrol euro 0w40 up against PP euro 5w40?

Pennzoil Platinum 5W-40 and Quaker State 5W-40 use natural-gas-based (GTL) API Group III+ or III++, and that should be good. Castrol 0W-40 probably has some API Group IV (PAO) mixed with petroleum-based API Group III. Which one has a higher base-oil quality? It is hard to say, but it probably does not make much difference.

 

[edyvw]

Pennzoil Platinum 5W-40 and Quaker State 5W-40 use natural-gas-based (GTL) API Group III+ or III++, and that should be good. Castrol 0W-40 probably has some API Group IV (PAO) mixed with petroleum-based API Group III. Which one has a higher base-oil quality? It is hard to say, but it probably does not make much difference.

Castrol Edge 0W40 SN version had probably close to 50% PAO. msds says 25-50%, but pour point was -60, so probably on higher end.
Here is my UOA os Castrol Edge 0W40 including 350 miles of track time at 100-102f temperature. Right column is Edge 0W30 in winter:

 

[Tifosi]

To answer the OP’s question directly there is no question in my mind that the Mobil 1 FS 0w40 is the choice. I don’t say that on speculation. I say that based on my experience looking at the FS 0w40 in our lab. If I was in a spot where I could not get my own oil I would grab that oil to put in any vehicle I own without question.

This is one SERIOUS endorsement for Mobil 1. Thank you.

 

[Nesterenko]

Quality wise they are total equals in my mind. but the decision is easy Mobil 1 EP $26.47 Castrol $28.94.

That 2 bucks a jug difference is a real game changer.

 

[ProbeGT]

It's shown on the Mobil Product Guide:
It shows 1,000ppm phosphorous, 1,100ppm zinc.

Based on Ph/Zn alone, Mobil wins. Castrol is down 100ppm at 900/1000.

 

[Shel_B]

That 2 bucks a jug difference is a real game changer.

Clearly it is for some.

 

[Bullwinkle007]

Why does nobody ever talk about Valvoline 540 Euro? Where was this fall in this group?

 

[jurko]

Does PP Euro SAE 5W-40 comes only in 1QT jugs or can you get it in 5QT jug also?

 

[Popsy]

It does come in 5L jugs (at least here in Canada) too.

 

[ChrisD46]

ExxonMobil Visom Group III+ base stocks readily beat the ExxonMobil SpectraSyn PAO base stocks in viscosity index (VI), which have VI = 126, 138, and 139 for KV100 = 4.1, 5.8, and 8.0 cSt, respectively. A higher base-oil viscosity index (BO VI) means less viscosity-index improver (VII) and a thicker base oil.

How would you rate the SP version ?

 

[Big_B]

The new Mobil 0w40FS SP will be my "Go To" oil for everything soon.
I might try HPL Super Car 0W40 in my snowmobile

 

[Tifosi]

Why does nobody ever talk about Valvoline 540 Euro? Where was this fall in this group?

Open a new thread about it and I am sure you will get plenty of people to participate in it.