Mobil Super HTHS

[zorobabel]

I e-mailed Mobil asking them to provide the HTHS values at 150C for the Mobil Super and Mobil Super HM lines since they're not in their respective PDS's.
They e-mailed me back: "No I apologize we cannot, as these values are not available for these products.".

 

[ARCOgraphite]

Are you expecting or hoping that the HM has a higher nominal HTHS than the SAE/ILSAC spec range?

 

[Quattro Pete]

Looks like the Super and Super HM 10w40 are going to be the only ones with ht/hs above 3.5 cP. Everything else is going to be below that since it meets ILSAC GF5.

 

[zorobabel]

Hoping but not expecting

Originally Posted By: ARCOgraphite
Are you expecting or hoping that the HM has a higher nominal HTHS than the SAE/ILSAC spec range?

 

[zorobabel]

It's exactly the 10w40 that I'm interested in.
I'm not convinced that not meeting ILSAC GF5 means a higher HTHS. Looking at the Castrol GTX, the 10w40 has a HTHS of 2.9 just like the 5w30 and 10w30.
Originally Posted By: Quattro Pete
Looks like the Super and Super HM 10w40 are going to be the only ones with ht/hs above 3.5 cP. Everything else is going to be below that since it meets ILSAC GF5.

 

[KCJeep]

Originally Posted By: zorobabel
It's exactly the 10w40 that I'm interested in.
I'm not convinced that not meeting ILSAC GF5 means a higher HTHS. Looking at the Castrol GTX, the 10w40 has a HTHS of 2.9 just like the 5w30 and 10w30.


No it doesn't. Castrol is just not very forthcoming on specs, it indicates it meets the minimum requirement of 2.9 but does not list the actual HTHS. That's what the < means. If you look at the kv@100 viscosity spread it is quite clear the Castrol is plenty thick, knowing Castrol the HTHS is likely around 3.7 to 3.9.

Why they just don't publish I don't know. A few of their newer lubes actually list HTHS now though.

 

[Quattro Pete]

Originally Posted By: zorobabel
It's exactly the 10w40 that I'm interested in.
I'm not convinced that not meeting ILSAC GF5 means a higher HTHS. Looking at the Castrol GTX, the 10w40 has a HTHS of 2.9

Castrol GTX 10w-40 has HT/HS of 3.6 cP:
http://msdspds.castrol.com/bpglis/Fusion...BPXE-A2ZRG9.pdf

SAE ratings were revised some years back. Any 10w-40 oil has to have HT/HS of at least 3.5 cP.

 

[Quattro Pete]

Originally Posted By: Quattro Pete
Castrol GTX 10w-40 has HT/HS of 3.6 cP:
http://msdspds.castrol.com/bpglis/Fusion...BPXE-A2ZRG9.pdf

Link got messed up. Here it is again:
http://msdspds.castrol.com/bpglis/Fusion...BPXE-A2ZRG9.pdf

And here is one for GTX HM 10w-40:
http://msdspds.castrol.com/bpglis/Fusion...BPXE-9UF427.pdf

 

[zorobabel]

Thanks Quattro Pete and KCJeep! Things make sense now.

 

[SR5]

Originally Posted By: zorobabel
Thanks Quattro Pete and KCJeep! .

Yep, those two are gold and always worth listeng to.

 

[Garak]

Every ILSAC 30 you find out there, incidentally, is going to have an HTHS of around 3.1 +/- 0.1.