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#4596722 - 12/07/17 01:07 AM Which kind of seal material are HM oils for ?
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Obviously paper or cork is not going to respond to seal conditioners or swellers, but what about neoprene or silicone seals; is that the material that HM oils are intended for?

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#4596739 - 12/07/17 02:52 AM Re: Which kind of seal material are HM oils for ? [Re: Merkava_4]
Char Baby Offline


Registered: 05/25/05
Posts: 10067
Loc: ROCHESTER, NY
I think that this is a good question and I have not thought of it myself.

Thanks for asking,

CB
_________________________
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'80 Firebird FORMULA V8/4bbl-purchased "NEW"
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#4596753 - 12/07/17 04:33 AM Re: Which kind of seal material are HM oils for ? [Re: Merkava_4]
dlundblad Offline


Registered: 09/30/13
Posts: 10181
Loc: Indiana
I would say neoprene for sure.

I had a rear main seal leak that M1 HM 10w30 stopped.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980


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#4596778 - 12/07/17 05:58 AM Re: Which kind of seal material are HM oils for ? [Re: Merkava_4]
Trav Offline


Registered: 11/20/06
Posts: 19298
Loc: MA, Mittelfranken.de
This is an material chart for O rings but the materials are also used in seals. Many seals used in engines today are very chemical resistant FFKM or Teflon. HM oil will not have much of an effect on these materials, the more these materials are used the more of a marketing gimmick HM oil becomes.

https://www.marcorubber.com/o-ring-chemical-compatibility-chart-1.htm
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#4596793 - 12/07/17 06:41 AM Re: Which kind of seal material are HM oils for ? [Re: Trav]
LEADED Offline


Registered: 07/13/11
Posts: 96
Loc: MICHIGAN USA
After 2000 with GM sealing problems with 60 V6 . VITON was preffered material along more durable Sealers impregnated Silicone & such . Nowadays all industry use much better Materials . As far as HM PCMO don't need them in modern blocks . My 2 cents

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#4596798 - 12/07/17 06:54 AM Re: Which kind of seal material are HM oils for ? [Re: Trav]
aquariuscsm Online   content


Registered: 12/30/06
Posts: 18283
Loc: Dallas,Tx USA
Originally Posted By: Trav
the more these materials are used the more of a marketing gimmick HM oil becomes.

https://www.marcorubber.com/o-ring-chemical-compatibility-chart-1.htm


I agree. As well as rtv used on valve cover gaskets. HM oils will not help these at all.
_________________________
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Quaker State Ultimate Durability 10W30
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Quaker State Ultimate Durability 5W30


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#4596850 - 12/07/17 08:03 AM Re: Which kind of seal material are HM oils for ? [Re: dlundblad]
LeakySeals Offline


Registered: 02/18/11
Posts: 6622
Loc: Hudson, NH
Originally Posted By: dlundblad
I would say neoprene for sure.

I had a rear main seal leak that M1 HM 10w30 stopped.

M1 HM swelled that seal right up!
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
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#4596926 - 12/07/17 09:07 AM Re: Which kind of seal material are HM oils for ? [Re: Trav]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: Trav
Many seals used in engines today are very chemical resistant FFKM or Teflon. HM oil will not have much of an effect on these materials, the more these materials are used the more of a marketing gimmick HM oil becomes.


Very true.

Originally Posted By: LEADED
Nowadays all industry use much better Materials. As far as HM PCMO don't need them in modern blocks . My 2 cents


Yes, older rubber formulations, like neoprene, just don't see much engine use anymore. Maybe in "el Cheapo" small block chevy gasket kits they still do?
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#4597004 - 12/07/17 10:16 AM Re: Which kind of seal material are HM oils for ? [Re: Merkava_4]
CT8 Offline


Registered: 10/09/14
Posts: 11219
Loc: Idaho
Marketing works
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#4597148 - 12/07/17 01:24 PM Re: Which kind of seal material are HM oils for ? [Re: CT8]
Scdevon Offline


Registered: 09/07/09
Posts: 325
Loc: Rockies
Originally Posted By: CT8
Marketing works


Extra ingredients added to oil in attempt to fix problems = less oil.

Marketing or not, seal conditioners work. I've personally witnessed at least 2 automatic transmissions with obviously worn seals straighten right out with "Trans-X" which is the king of seal conditioner overdose. I'm not sure it's a good idea to add a LITTLE Trans-X to engine oil, but I'm sure someone's thought of it.
_________________________
2003 Mustang Mach 1. 32V 4.6 Liter. Motorcraft Syn Blend 5W30
1970 Mustang Convertible 302-2V Auto (Stock) M/C 10W30
1970 VW Beetle 1600 DP

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#4597314 - 12/07/17 05:03 PM Re: Which kind of seal material are HM oils for ? [Re: Merkava_4]
SR5 Offline


Registered: 07/07/15
Posts: 4516
Loc: Down Under
High Mileage oils use to be a thick for grade oil, with extra seal conditioners (which are in regular oil anyway - but to a lesser amount) and often with elevated ZDDP levels (API SL) for extra wear protection.

But now with many insisting on only using API SN oils, the ZDDP zinc levels have been reduced to regular ILSAC amount, and the seal conditioners don't work on many modern seal materials. So what you are left with is a slightly thicker oil, with a big font HM on the label.

Strangely enough HM oils have never been popular in Australia, we simply step it up a viscosity grade as the car ages.
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Penrite Vantage 10W40 SN & A3/B4 + Wesfil-Cooper Z154

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#4597353 - 12/07/17 05:44 PM Re: Which kind of seal material are HM oils for ? [Re: Merkava_4]
Silk Offline


Registered: 07/26/03
Posts: 4612
Loc: New Zealand
Rear main seals will be silicone because of the higher heat, front and cam seals viton or what ever. I know a silicone seal will swell in kerosene, so maybe they will work better on a rear main than other seals. I hope so, my rear main leaks.
_________________________
1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.

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#4597843 - 12/08/17 08:35 AM Re: Which kind of seal material are HM oils for ? [Re: Silk]
Trav Offline


Registered: 11/20/06
Posts: 19298
Loc: MA, Mittelfranken.de
Teflon based is also common for rear main seals now, you know you have one when it comes with an installation sleeve. They are finicky to install but work well and leave no groove in the crank after long use, swellers conditioners have no effect on them.
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