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HM oils #5186045 08/13/19 02:25 PM
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loneryder Offline OP
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Just what is in HM oils that stops or slows oil leaks? Also do they contain more detergents?

Re: HM oils [Re: loneryder] #5186064 08/13/19 02:43 PM
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SirTanon Offline
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The consensus here is that HM oils have a slightly higher dose of detergents and a heavier dose of seal conditioners.


2013 Nissan Altima SV - 2.5 liter/CVT - 118,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 67,000mi
2010 Ford Fusion - 274,500mi
Re: HM oils [Re: SirTanon] #5186100 08/13/19 03:13 PM
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demarpaint Offline
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Originally Posted by SirTanon
The consensus here is that HM oils have a slightly higher dose of detergents and a heavier dose of seal conditioners.

And are on the "thicker" side of the grade.


God Bless Our Troops

Re: HM oils [Re: demarpaint] #5186204 08/13/19 05:02 PM
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CR94 Offline
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Originally Posted by demarpaint
... And are on the "thicker" side of the grade.
Not necessarily. See Pennzoil Platinum HM.


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Re: HM oils [Re: demarpaint] #5186278 08/13/19 06:32 PM
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spk2000 Offline
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Originally Posted by demarpaint
Originally Posted by SirTanon
The consensus here is that HM oils have a slightly higher dose of detergents and a heavier dose of seal conditioners.

And are on the "thicker" side of the grade.


I have found the Valvoline Maxlife to be on the lighter side of the spectrum. Mobil 1 and most brands are generally of higher viscosity though.


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Re: HM oils [Re: loneryder] #5186386 08/13/19 09:00 PM
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Loobit Offline
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HM oils have a larger dose of seal conditioners. Other things that differentiate it is a tad more ZDDP, most may be on the thicker side of the specified weight, more detergent is definitely included and makes the oil act like a mild flush, and you may even see a good dose of moly. I think many HM oils were API SL up until recent years (correct me if I'm wrong). Mobil 1 HM recently became an API SN oil. The only HM oil I can think of that is API SL still is Royal Purple HMX.

Re: HM oils [Re: demarpaint] #5186394 08/13/19 09:09 PM
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bbhero Online Content
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Originally Posted by demarpaint
Originally Posted by SirTanon
The consensus here is that HM oils have a slightly higher dose of detergents and a heavier dose of seal conditioners.

And are on the "thicker" side of the grade.


True ^^^^^

On both counts..

Havoline high mileage 5w30 has a HTHS of 3.4... And most others are above 3.2.


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Re: HM oils [Re: SirTanon] #5186941 08/14/19 12:32 PM
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loneryder Offline OP
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Originally Posted by SirTanon
The consensus here is that HM oils have a slightly higher dose of detergents and a heavier dose of seal conditioners.

What do they use for "seal conditioners"?

Re: HM oils [Re: loneryder] #5186966 08/14/19 12:55 PM
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OilUzer Offline
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I don't recall any consensus except that HM oil are on the thicker side of the spec. Meaning that a thicker non HM oil would be the same ... I thought HM oils having extra seal conditioner and/or sweller were not substantiated?!

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