M1 5W-30 has higher HTHS than 10W-30

[vinu_neuro]

Both oils being from the same line, I don't think I've ever seen a 10W-30 have a lower HTHS than a 5w30. Perhaps XOM is seeing 10W-30 dying, and are cutting cost in that product. Or it's typo.

5w30 vs. 10W-30

VI: 172 vs. 146
HTHS: 3.1 vs. 3.0

 

[Clevy]

Somewhere its posted that the 0w-30 is thicker at operating temp than both the 5w and 10w from Mobil iirc.
I was started when the info came up that when you are expecting that you bought thin oil its thicker than the next thicker grade up in the line.
Weird

 

[donnyj08]

the difference is minimal. both are 30 wt which needs to be above 2.9cp so yes the 5w30 blend is slightly thicker at operating temp than the 10w30. the 10w30 however, will be slightly thicker when cold.

 

[FowVay]

I'm surprised at the difference in viscosity index.

 

[crinkles]

Mobil no longer sells 10w-30 retail/OTC down here, only 5w30, 0w-40 and 5w-50.

 

[bigt61]

I think the 10W-30 is an old formula with "old technology". Not many cars call for it so they haven't spent much money on improving it - just enough to pass the API & ILSAC latest specs.

 

[Quattro Pete]

Originally Posted By: vinu_neuro
Both oils being from the same line, I don't think I've ever seen a 10W-30 have a lower HTHS than a 5w30. Perhaps XOM is seeing 10W-30 dying, and are cutting cost in that product. Or it's typo.

5w30 vs. 10W-30

VI: 172 vs. 146
HTHS: 3.1 vs. 3.0



That's partly because their 10w-30 is a very thin 30... only 10.1 cSt at 100C, so it's actually thinner than their 5w30 at operating temp.

 

[virginoil]

Splitting hairs 3.0 vs 3.1 or what you can't be serious ?

The calculation, data measuring equipment calibration or differences between batches probably has greater tolerances for error or quality in manufacture that is deemed acceptable.

Interestingly the M1 EP has it the other way round.

The Mobil 1 EP 5w30 HTHS = 3.0
The Mobil 1 EP 10w30 HTHS = 3.1

Nothing here to lose sleep over though.

 

[supercity]

It is unusual but I can't see why a 10w30 can't be blended on purpose to have a lower HTHS.

Have a look at Penrite Pro 5 vs Pro 10

10w30 is clearly the lighter oil. It is more than likely to have a lower HTHS also.

 

[vinu_neuro]

The point of this thread is that unusually, M1 is obviously using an inferior base oil or VM within the same line.

 

[CATERHAM]

Guys you're wrong, M1 10W-30 is not lighter due to it's lower 146 VI.
It'd HTHSV could be 3.049cP and M1 5w30 3.051cP; the difference in reality being insignificant.
The lower KV100 spec' simply reflects the lower polymer level of the 10W-30 formulation.
If two oils have the same HTHSV spec', the oil with the lower VI will be heavier at all temp's below 150C, and a 20+ point VI difference is enough to see a real operational viscosity difference at normal operating temp's of 80-95C.

 

[Quattro Pete]

CATERHAM, if the operating temp is 100C, then based on the specs, the M1 10w-30 is clearly lighter than M1 5w30 at that temp.

 

[CATERHAM]

Originally Posted By: Quattro Pete
CATERHAM, if the operating temp is 100C, then based on the specs, the M1 10w-30 is clearly lighter than M1 5w30 at that temp.

Except the kinematic measure doesn't correlate at all well with actual operational viscosity in a running engine.
If you know the HTHSV and the VI you better off ignoring the KV100 spec'.
The whole subject of why HTHSV trumps KV100 was discussed in detail in the following:
https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2276634&page=1