Mobil 1 HM 10W-30

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I thought it was like 3.3 or something? It's been a while, lol.

Historically, it's been 3.5 for a long time. Part of the ACEA A3/B3 rating so it can't (couldn't) be less. The 5w-30 is like 3.2, and that's a big reason 10w-30hm has been so popular with so many people.

If it's still A3/B3, its still 3.5 - one proxy to tell since they've dropped revealing that. It's still not EC, so safe bet it still is.
 

OVERKILL

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Historically, it's been 3.5 for a long time. Part of the ACEA A3/B3 rating so it can't (couldn't) be less.

If it's still A3/B3, its still 3.5 - one proxy to tell since they've dropped revealing that. It's still not EC, so safe bet it still is.
Current PDS lists nothing ACEA from what I can see:
Screen Shot 2022-03-05 at 3.02.22 PM.jpg
 

Gene K

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I sent an email asking if it's still >3.5 HTHS. We will see if I get anything besides "proprietary". Although how asking viscosity could be proprietary is beyond me.
 
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1646510878504.png
1646510905085.png

This is what was claimed on june of last year, from what I found in the web archive, the current claimed specs for viscosity, density, pour point, and flash point appear the same, but A3/B3 is no longer claimed
 
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I think it's interesting they stopped claiming A3/B3 on the 10W-40, here's a Jug of 10W40 SP, that I have out in my garage from June of Last year.

1646511217363.jpg


But the current image on Walmart shows no ACEA A3/B3
1646511303157.jpg


I'd think just about any decent 10W-40 could claim A3/B3, so I wonder why they stopped claiming it
 

Gene K

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I think it's interesting they stopped claiming A3/B3 on the 10W-40, here's a Jug of 10W40 SP, that I have out in my garage from June of Last year.

View attachment 91452

But the current image on Walmart shows no ACEA A3/B3
View attachment 91453

I'd think just about any decent 10W-40 could claim A3/B3, so I wonder why they stopped claiming it

I have found images of the M1 HM 10W-30 with API SP with and without the ACEA A3/B3. I have been told you may now may have to meet A3/B4 so it's possible that's the reason for the removal.
 
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I have found pictures of M1 HM 10W-30 with API SP with and without the ACEA A3/B3. I have been told you now have to meet A3/B4 so may be the reason for the removal. Not sure if the oil can meet B4.
It appears A3/B3 was removed in ACEA-2021
 

Gene K

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I only the HM version.
Just looked through my archives. M1 10w-30 - HTHS 3.0. M1 HM 10w-30 - HTHS 3.5.

I think it likely still is just based on the 100C and 40C numbers and the fact it still isn't ILSAC but with HTHS no longer on the PI sheets, A3/B3 abolished and A3/B4 requiring a higher TBN I don't see any way of confirming without Mobil says so or paying to have it tested.
 
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I think it likely still is just based on the 100C and 40C numbers and the fact it still isn't ILSAC but with HTHS no longer on the PI sheets, A3/B3 abolished and A3/B4 requiring a higher TBN I don't see any way of confirming without Mobil says so or paying to have it tested.
Right. The data I was referring is about 10 years old.
 
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