Recent Topics
Oil recommendation for 2014 2.5l Suburu Forester
by tomartomau - 08/23/19 11:32 PM
Castrol 5W50
by Snagglefoot - 08/23/19 11:29 PM
Camry Broke Down
by Nick1994 - 08/23/19 10:51 PM
Pumpkin Beer
by Capt - 08/23/19 09:26 PM
Possible bad Iridium plug
by Eric Smith - 08/23/19 08:57 PM
Is the 5.7gm engine still made brand new?
by motor_oil_madman - 08/23/19 08:19 PM
Motomaster OEPlus MOPH/MOCH Filters
by gamefoo21 - 08/23/19 07:29 PM
Man's best friend!
by Mad_Hatter - 08/23/19 06:53 PM
2007 Ford Fusion Cam Pics
by tig1 - 08/23/19 05:31 PM
Cloning a Lexus key
by Nayov - 08/23/19 04:23 PM
2011 GMC Acadia Shock/Strut Replacement
by panthermike - 08/23/19 03:49 PM
Confusion on oil to use on BMW 328i 2010
by goldenjava - 08/23/19 03:21 PM
ProSelect 27356 cut open
by Sayjac - 08/23/19 03:04 PM
Electrolux - Dryer reliability warning.
by pezzy669 - 08/23/19 02:37 PM
Microfiber Towels for different applications?
by Quattro Pete - 08/23/19 01:53 PM
Coated vs. painted rotors
by atikovi - 08/23/19 01:13 PM
New spark plugs, occasional misfire
by avacado11 - 08/23/19 12:34 PM
Newest Members
Boogyman, GeoffPD, CabanaBanana, tblack, goldenjava
69048 Registered Users
Who's Online Now
22 registered members (billt460, bbhero, Bailes1992, Char Baby, bmod305, avi1777, 1 invisible), 527 guests, and 20 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics293,713
Posts5,045,463
Members69,048
Most Online3,532
Jul 30th, 2019
Donate to BITOG
Print Thread
Hop To
What seals do HM oils condition? #4893301 10/10/18 07:02 PM
Joined: Nov 2002
Posts: 31,675
B
buster Offline OP
OP Offline
B
Joined: Nov 2002
Posts: 31,675
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.



2019 Nissan Frontier Pro 4X
2019 Subaru Impreza Sport
Re: What seals do HM oils condition? [Re: buster] #4893311 10/10/18 07:08 PM
Joined: Aug 2004
Posts: 21,006
The Critic Offline
Offline
Joined: Aug 2004
Posts: 21,006
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 - 195K - Idemitsu ZEPRO Adv. Moly 0W-20
2007 Honda Accord 2.4 - 138K - Mobil 1 EP HM 5W-30
Re: What seals do HM oils condition? [Re: The Critic] #4893326 10/10/18 07:33 PM
Joined: Nov 2002
Posts: 31,675
B
buster Offline OP
OP Offline
B
Joined: Nov 2002
Posts: 31,675
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


2019 Nissan Frontier Pro 4X
2019 Subaru Impreza Sport
Re: What seals do HM oils condition? [Re: buster] #4893342 10/10/18 07:57 PM
Joined: May 2009
Posts: 887
A
anndel Offline
Offline
A
Joined: May 2009
Posts: 887
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
Joined: Sep 2005
Posts: 6,552
W
Warstud Offline
Offline
W
Joined: Sep 2005
Posts: 6,552
Any that are rubber.

Re: What seals do HM oils condition? [Re: Warstud] #4893385 10/10/18 08:49 PM
Joined: Dec 2017
Posts: 4,778
S
Snagglefoot Offline
Offline
S
Joined: Dec 2017
Posts: 4,778
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
Joined: May 2006
Posts: 4,135
D
dwendt44 Offline
Offline
D
Joined: May 2006
Posts: 4,135
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
Joined: Dec 2017
Posts: 427
V
VeryNoisyPoet Offline
Offline
V
Joined: Dec 2017
Posts: 427
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
Joined: May 2015
Posts: 759
S
SavagePatch Offline
Offline
S
Joined: May 2015
Posts: 759
What about Spark Plug Tube Seals?

Re: What seals do HM oils condition? [Re: SavagePatch] #4893576 10/11/18 05:07 AM
Joined: Jul 2011
Posts: 134
L
LEADED Offline
Offline
L
Joined: Jul 2011
Posts: 134
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
Joined: Jan 2018
Posts: 428
R
RyanY Online Content
Online Content
R
Joined: Jan 2018
Posts: 428
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 >123k miles (Valvoline synthetic HM + ACDelco PF2129G)

2012 Honda Odyssey EX-L >100k miles (Pennzoil Platinum 5W-20 + STP S6607XL)
Re: What seals do HM oils condition? [Re: buster] #4893633 10/11/18 07:19 AM
Joined: Jun 2002
Posts: 20,306
MolaKule Offline
Global Moderator
Offline
Global Moderator
Joined: Jun 2002
Posts: 20,306
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.

The value of a scientific theory is its ability to prompt further study, not that it has any relation to the established facts of scientific reality.
Re: What seals do HM oils condition? [Re: buster] #4893967 10/11/18 01:44 PM
Joined: Mar 2016
Posts: 1,357
J
jongies3 Offline
Offline
J
Joined: Mar 2016
Posts: 1,357
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
Joined: Jul 2018
Posts: 162
D
DONWATERS Offline
Offline
D
Joined: Jul 2018
Posts: 162
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.

Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™