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#4776135 - 06/03/18 09:21 AM Are today's full syn HM oils thicker than non-HM?
cheesepuffs Offline


Registered: 09/24/13
Posts: 559
Loc: Connecticut
I remember a few years ago before Maxlife blend became resource conserving, people liked that it was on the thick side for its grade. It was commonly known that high mileage oils ran a bit thick. Now with Platinum HM, Maxlife Syn HM, etc, are these modern synthetic HM oils still thicker than their regular synthetic counterparts? Or is that a thing of the past.
_________________________
2008 Honda Accord Coupe V6

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#4776200 - 06/03/18 10:50 AM Re: Are today's full syn HM oils thicker than non-HM? [Re: cheesepuffs]
mx5miata Offline


Registered: 03/28/10
Posts: 369
Loc: Ny
I never heard of high mileage oil being thicker just additives like seal conditioner. if the oil is 5w30 its a 5w30 high mileage or non. of what I know anyway.
_________________________
NAPA FULL SYNTHETIC 0w20 Partsplus oil filter
Wix air filter

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#4776220 - 06/03/18 11:14 AM Re: Are today's full syn HM oils thicker than non-HM? [Re: cheesepuffs]
ka9mnx Offline


Registered: 05/21/18
Posts: 50
Loc: South Carolina
Some are, yes. I'm only familiar with Mobil1 products.

Mobil1 5w-30 has an HTHS of 3.1 and Mobil1 HM 5w-30 is 3.1 so they are basically the same

Mobil1 10w-30 has an HTHS of 3.0 and Mobil1 HM 10w-30 is 3.5 so the HM is thicker.

I could be wrong but I believe HTHS is what defines a "thicker/thinner" oil. With than thinking Mobil1 10w-30 is thinner than 5w-30 at operating temps.

So it's not an easy blanket answer. You have to check the spec's.

On the other hand, The 5w-30 [email protected] is 11.0 and the HM is 12.1 which would make the HM thicker at op temps.

Someone help me out here!
_________________________
2005 Ranger Edge 3.0 M1 5w-30 HM/Motorcraft
2000 Toyota 4Runner 3.4 M1 10w-30 HM/Toyota
1997 B2500 Van 3.9 M1 10w-30 HM/Mopar
1993 F150 4.9 M1 10w-30 HM/Motorcraft

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#4776222 - 06/03/18 11:15 AM Re: Are today's full syn HM oils thicker than non-HM? [Re: cheesepuffs]
rollinpete Offline


Registered: 03/20/17
Posts: 451
Loc: West Ma.
Two that I know of with a higher viscosity are Mobil 1 syn. hm 5w30 and 10w30,
there higher than there reg.syn. counter parts.
Here's a list of oil's I've used or have in my stash.

A. Mobil 1 5w30 fullsyn. 100(11.) 40(61.7) vi index (172)
B. Mobil 1 10w30 fulsyn. 100(10.1) 40(63.2) vi index (146)
C. Pennzoil 5w30 platinum syn. 100(10.3) 40(56.9) vi index (170)
D. Pennzoil 10w30 platinum syn. 100(10.3) 40(63.3) vi index (150)
E. Valvoline 10w30 fullsyn. maxlife hm. 100(10.8) 40(67.2) vi index (151)
F. Valvoline 5w30 fullsyn. maxlife hm. 10(10.1) 40(59.0) vi index (160)
G. Valvoline 5w30 full synpower 100(10.2) 40(60.1) vi index (158)
H. Valvoline 10w30 full synpower 100(10.8) 40(66.8) vi index (151)
I. Pennzoil 5w30 platinum syn. hm. 100(10.1) 40(55.6) vi index (170)
J. Pennzoil 10w30 platinum syn. hm. 100(10.6) 40(65.1) vi index (152)
K.Pennzoil 0w40 platinum syn. euro 100(13.0) 40(72.2) vi index (183)
L. Castrol gtx magnatec 5w30 100(11.2) 40(68.6) vi index (156)
M. Castrol gtx magnatec 10w30 100(11.6) 40(71.51) vi index (157)
N. Mobil 1 HM fullsyn. 5w30 100(12.1) 40(72) vi index (165)
O. Mobil 1 HM fullsyn. 10w30 100(12.1) 40(78) vi index (149)
P. Quaker state Ultimate Dur. syn. 5w30 100(10.8) 40(60) vi index (178)
Q. Quaker state Ulitimate Dur. syn. 10w30 100(10.3) 40(61) vi index (157)
R. Quaker state hm. synblend 5w30 100(10.7) 40(63.3) vi index (159)
S. Quaker state hm. synblend 10w30 100(10.5) 40(68.4) vi index (141)
T. Pennzoil ultra Platinum syn 5w30 100(10.3 40(56.3) vi index (173)
U. Pennzoil ultra Platinum syn 10w30 100(10.4) 40(62.8) vi index (155)
_________________________
Pete.
97 Ford Expl.Sport 4.0 ohv 4wd 5spddrive183k miles
Last Change;
Penn. Plat. HM 5w30
Fram xg8a, Fram CA8141

(Oil) Where would we be with out it.


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#4776231 - 06/03/18 11:28 AM Re: Are today's full syn HM oils thicker than non-HM? [Re: cheesepuffs]
Indydriver Offline


Registered: 03/20/11
Posts: 2152
Loc: Indiana
Mobil 1 says:

“(HM has a) higher base oil viscosity to help reduce leaks and provide better high temperature protection”

For 5W-30, XOM publishes these viscosity specs:

At 40C: HM=72 / STD = 61.7
At 100C: HM=12.1 / STD = 11.0

So, one must conclude that yes, at least at Mobil1, HMs have higher viscosity or are “thicker” as you say.
_________________________
2017 Mazda CX3 1000 FF
2014 Camaro 2SS/RS LS3 Vert 13,000 M1
2012 Sienna 75,000 M1
2011 Accord VCMV6 75,000 M1
2007 Tahoe 130,000 M1 HM


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#4776305 - 06/03/18 01:49 PM Re: Are today's full syn HM oils thicker than non-HM? [Re: cheesepuffs]
KCJeep Online   content


Registered: 06/30/11
Posts: 6998
Loc: Mahzurrah!
A few still are. Last I was aware of, Castrol HM, M1 HM and Pennzoil HM were all on the thick side of grade and thicker than their regular line up counterparts.
_________________________
09 Lincoln MKZ AWD 91k - M1 AFE 0w30
12 KIA Sedona 86k - Edge 0w40
09 Ford Focus 129k - GTX UltraClean 5w30
00 Chevy Lumina 195k - Supertech FS HM 5w30
04 Jeep Grand Cherokee gone but not forgotten...

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#4777080 - 06/04/18 10:21 AM Re: Are today's full syn HM oils thicker than non-HM? [Re: cheesepuffs]
mx5miata Offline


Registered: 03/28/10
Posts: 369
Loc: Ny
Wow API allows this approved

So I buy 5w30 High mileage and I'm not pouring 5w30, what weight is it?

Since I can't scientifically answer this my guess would be the additive pack in high mileage oils changes its properties at different temperatures and stress loads while maintaining its characteristics of the specified weight.


Edited by mx5miata (06/04/18 10:21 AM)
_________________________
NAPA FULL SYNTHETIC 0w20 Partsplus oil filter
Wix air filter

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#4777123 - 06/04/18 10:58 AM Re: Are today's full syn HM oils thicker than non-HM? [Re: mx5miata]
cheesepuffs Offline


Registered: 09/24/13
Posts: 559
Loc: Connecticut
Originally Posted By: mx5miata
Wow API allows this approved

So I buy 5w30 High mileage and I'm not pouring 5w30, what weight is it?

Since I can't scientifically answer this my guess would be the additive pack in high mileage oils changes its properties at different temperatures and stress loads while maintaining its characteristics of the specified weight.


There is a tolerance for each grade. You can have two different 30 weight oils that are still slightly different but still fall within range to be called a 30 weight.
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2008 Honda Accord Coupe V6

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#4777125 - 06/04/18 11:01 AM Re: Are today's full syn HM oils thicker than non-HM? [Re: mx5miata]
PimTac Online   content


Registered: 03/04/17
Posts: 4278
Loc: Soviet State of Washington
Originally Posted By: mx5miata
Wow API allows this approved

So I buy 5w30 High mileage and I'm not pouring 5w30, what weight is it?

Since I can't scientifically answer this my guess would be the additive pack in high mileage oils changes its properties at different temperatures and stress loads while maintaining its characteristics of the specified weight.




Just in case you haven’t seen this;

https://www.bobistheoilguy.com/viscosity-charts/
_________________________
2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter


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#4777166 - 06/04/18 11:45 AM Re: Are today's full syn HM oils thicker than non-HM? [Re: cheesepuffs]
mx5miata Offline


Registered: 03/28/10
Posts: 369
Loc: Ny
thanks guys very interesting learn something new each day smile
_________________________
NAPA FULL SYNTHETIC 0w20 Partsplus oil filter
Wix air filter

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#4778556 - 06/05/18 08:41 PM Re: Are today's full syn HM oils thicker than non-HM? [Re: cheesepuffs]
Garak Offline


Registered: 12/05/09
Posts: 24574
Loc: Regina, Saskatchewan, Canada
Some are, these days, most are not. If they're ILSAC rated, they won't be appreciably thicker than their non-HM brothers.
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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