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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: 17465
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: 9277
Loc: ROCHESTER, NY
I think that this is a good question and I have not thought of it myself.

Thanks for asking,

CB
_________________________
"Retired"
'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'06 Mazda 3i 2.0L
'15 Nissan Altima 2.5 SV

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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: 8936
Loc: Midwest
I would say neoprene for sure.

I had a rear main seal leak that M1 HM 10w30 stopped.
_________________________
03 Jeep WJ 4.0 197k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 170k M1 0w40 Mann HU818X
97 Chevy Blazer 4.3 138k Synpower 5w30 Fram TG3980


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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: 16624
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
_________________________
ASE L1, Master. Deutsch Meisterbrief.

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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: 61
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 Offline


Registered: 12/30/06
Posts: 16995
Loc: South Texas,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.
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Pennzoil Platinum 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State 0W20



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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: 6246
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 155k. M1 FU
03 Maxima 3.5L Unknown miles ST 10w30

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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: 3481
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: 9593
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: 293
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: 3859
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.
_________________________
M1 5W30 + Repco Z154 filter

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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: 3917
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 - MSL 5/30
1996 Volvo T5 - Cocktail, don't ask.

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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: 16624
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.
_________________________
ASE L1, Master. Deutsch Meisterbrief.

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