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What seals do HM oils condition? #4893301
10/10/18 07:02 PM
10/10/18 07:02 PM
Joined: Nov 2002
Posts: 31,309
NJ
buster Offline OP
buster  Offline OP

Joined: Nov 2002
Posts: 31,309
NJ
The most common engine seals that eventually seems to leak are the rear main and valve cover gasket. What other seals would a HM oil help prevent leaks in?

Rear main,
Crank Seal
Front/Rear CAM seals
OCV?

It won't have an impact on valve cover.



2015 Mazda 3 2.0 - Mobil 1 5w20
Re: What seals do HM oils condition? [Re: buster] #4893311
10/10/18 07:08 PM
10/10/18 07:08 PM
Joined: Aug 2004
Posts: 20,837
CA
The Critic Offline
The Critic  Offline

Joined: Aug 2004
Posts: 20,837
CA
HM oil is unlikely to have any impact on surfaces that were sealed using RTV.

I would expect it to have an impact on all other seals/gaskets though.


2011 Toyota Prius 1.8L - 190K - Idemitsu ZEPRO Adv. Moly 0W-20
2007 Honda Accord 2.4 - 137K - Mobil 1 EP HM 5W-30
Re: What seals do HM oils condition? [Re: The Critic] #4893326
10/10/18 07:33 PM
10/10/18 07:33 PM
Joined: Nov 2002
Posts: 31,309
NJ
buster Offline OP
buster  Offline OP

Joined: Nov 2002
Posts: 31,309
NJ
Originally Posted by The Critic
HM oil is unlikely to have any impact on surfaces that were sealed using RTV.

I would expect it to have an impact on all other seals/gaskets though.


cheers


2015 Mazda 3 2.0 - Mobil 1 5w20
Re: What seals do HM oils condition? [Re: buster] #4893342
10/10/18 07:57 PM
10/10/18 07:57 PM
Joined: May 2009
Posts: 887
Hawaii, USA
anndel Offline
anndel  Offline

Joined: May 2009
Posts: 887
Hawaii, USA
Front main seal


1993 Toyota 4x4 p/u, 2.4L 22RE 4 cyl - M1 EP 10W-30, Fram UG Filter
2005 Toyota Avalon XL, 3.5L V6, Amsoil XL 5W-30, Amsoil Filter
2014 Toyota Tacoma 4.0L V6, Amsoil SS 5W-30, Yota OEM Filter
Re: What seals do HM oils condition? [Re: buster] #4893382
10/10/18 08:46 PM
10/10/18 08:46 PM
Joined: Sep 2005
Posts: 6,417
MIchigan
Warstud Offline
Warstud  Offline

Joined: Sep 2005
Posts: 6,417
MIchigan
Any that are rubber.

Re: What seals do HM oils condition? [Re: Warstud] #4893385
10/10/18 08:49 PM
10/10/18 08:49 PM
Joined: Dec 2017
Posts: 4,506
SE British Columbia, Canada
Snagglefoot Online content
Snagglefoot  Online Content

Joined: Dec 2017
Posts: 4,506
SE British Columbia, Canada
I imagine the front seal and rear main seal are most important and the rear main seal is the hardest to replace.


If you want the job done right......do it yourself.
Re: What seals do HM oils condition? [Re: buster] #4893484
10/10/18 11:08 PM
10/10/18 11:08 PM
Joined: May 2006
Posts: 4,128
Central Wisconsin
dwendt44 Offline
dwendt44  Offline

Joined: May 2006
Posts: 4,128
Central Wisconsin
Hopefully the valve seals would benefit from HM oils as well and the
front and rear crank seals.


My 2¢


There's no such thing as:
Too big of a battery,
Too large of a gas tank,
or too loud of a horn,
or too bright headlights.
Re: What seals do HM oils condition? [Re: dwendt44] #4893492
10/10/18 11:29 PM
10/10/18 11:29 PM
Joined: Dec 2017
Posts: 427
California
VeryNoisyPoet Offline
VeryNoisyPoet  Offline

Joined: Dec 2017
Posts: 427
California
Originally Posted by dwendt44
Hopefully the valve seals would benefit from HM oils as well and the
front and rear crank seals.
My 2¢


I've used high mileage oils from Pennzoil, Castrol, Mobil 1, and Valvoline for the past 30k miles. In that time, the puff of blue smoke on startup from weak valve seals has gone from significant down to almost non-existent. When I had the intake manifold off this spring I could see a tiny bit of oil seeping down the valve stems, but apparently that's not enough to make any visible smoke when it fires up. I did have a rear cam seal start to weep this winter, but that may have been previously weakened when the pcv system failed and pressurized the crankcase a few years back. I know it puked oil from the top end when that happened.

Don't have good data on overall oil consumption with HM vs non-HM since the car had slow leaks of various nature from hoses and places other than seals up until this year when I fixed the last of the problems. This oci it's using about 1 quart in 5k miles.


1998 V70 GLT / 202k miles [10w-30 Valvoline Syn w/ Maxlife Tech + Mann W917 filter]

"Use yah blinkah!"

"Be nice. The alternative involves an air horn and 7000 lumens of high beam."
Re: What seals do HM oils condition? [Re: buster] #4893504
10/11/18 12:10 AM
10/11/18 12:10 AM
Joined: May 2015
Posts: 739
California
SavagePatch Offline
SavagePatch  Offline

Joined: May 2015
Posts: 739
California
What about Spark Plug Tube Seals?

Re: What seals do HM oils condition? [Re: SavagePatch] #4893576
10/11/18 05:07 AM
10/11/18 05:07 AM
Joined: Jul 2011
Posts: 132
MICHIGAN USA
LEADED Offline
LEADED  Offline

Joined: Jul 2011
Posts: 132
MICHIGAN USA
This is 2018 , most Seals nowadays are VITON , not your 1970 rubber different Materials are used in sealing aModern engine . I use Hi Milage oil in lawn Tractor .

Re: What seals do HM oils condition? [Re: LEADED] #4893589
10/11/18 05:54 AM
10/11/18 05:54 AM
Joined: Jan 2018
Posts: 393
South Carolina (SC)
RyanY Offline
RyanY  Offline

Joined: Jan 2018
Posts: 393
South Carolina (SC)
Originally Posted by LEADED
This is 2018 , most Seals nowadays are VITON , not your 1970 rubber different Materials are used in sealing aModern engine . I use Hi Milage oil in lawn Tractor .


Good point, but when did this start? HM oil cut down consumption in my 2007 from 1qt/1k to about half a qt/5k. I don't know what it is doing but it is doing it well.


2007 Cadillac CTS 3.6L >121k miles (Magnatec 5W-30 + Fram Ultra; Maxlife ATF)

2012 Honda Odyssey EX-L >98k miles (Pennzoil Platinum 5W-20 + STP XL; Pennzoil Platinum LV ATF)
Re: What seals do HM oils condition? [Re: buster] #4893633
10/11/18 07:19 AM
10/11/18 07:19 AM
Joined: Jun 2002
Posts: 20,135
Iowegia - USA
MolaKule Offline
Global Moderator
MolaKule  Offline
Global Moderator

Joined: Jun 2002
Posts: 20,135
Iowegia - USA
Originally Posted by MolaKule
When discussing seals such as in engines, transmissions, and other driveline components, the context is that of using flexible, elastomeric materials to keep fluids contained within the mechanical system that have rotating components exiting the system, such as protruding rotating shafts.

For a gasket, the context is that of using a material (such as silicone or cork or composite), or some other material to keep fluids contained in and around stationary objects, such as the valve cover gasket on an engine or the pan gasket on an automatic transmission.


Both seals and gaskets "prevent" loss of fluids...


Conditioning seals refers to the following actions:

Seal swell due to Seal elastomer molecular replacement
Seal cleaning,
.

Last edited by MolaKule; 10/11/18 07:23 AM.

Infinity is a rather long time - especially towards the end. smile
Re: What seals do HM oils condition? [Re: buster] #4893967
10/11/18 01:44 PM
10/11/18 01:44 PM
Joined: Mar 2016
Posts: 1,315
MT
jongies3 Offline
jongies3  Offline

Joined: Mar 2016
Posts: 1,315
MT
I personally don't think they do anything different than non high mileage oils. I personally think HM is just a marketing term. I've never noticed a difference in stopping oil leaks or reducing burn off with HM and standard conventional oil. Never tried HM synthetics but I imagine the results would be similar. Another thing to consider is if HM oils are such a great thing, why are there no diesel HM oils? Diesel engines typically outlast gas engines by almost double the mileage so why don't we see things like Rotella, Delo or Delvac HM brews? Food for thought.


2004 Toyota Tacoma 3.4 V6: Mobil 1 AFE 0W-30, FRAM PH3614 filter
2003 Buick Park Avenue Ultra S/C 3.8 V6: PYB 10W-30, FRAM COR3387 filter
2013 Honda 400EX ATV: Mobil 1 Racing 4t 10W-40, OEM filter
Re: What seals do HM oils condition? [Re: buster] #4894194
10/11/18 07:25 PM
10/11/18 07:25 PM
Joined: Jul 2018
Posts: 162
Florida
DONWATERS Offline
DONWATERS  Offline

Joined: Jul 2018
Posts: 162
Florida
I think HM oils are all on the thicker side of the stated viscosity which may cut down on leaks also. I also believe that conventional oil is always better at slowing leaks than synthetic given the same weights.

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