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What seals do HM oils condition? #4893301 10/10/18 07:02 PM
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buster Offline OP
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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
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The Critic Offline
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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
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buster Offline OP
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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
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anndel Offline
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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
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Warstud Online Content
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Any that are rubber.

Re: What seals do HM oils condition? [Re: Warstud] #4893385 10/10/18 08:49 PM
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Snagglefoot Offline
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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
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dwendt44 Offline
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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
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VeryNoisyPoet Offline
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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
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SavagePatch Offline
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What about Spark Plug Tube Seals?

Re: What seals do HM oils condition? [Re: SavagePatch] #4893576 10/11/18 05:07 AM
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LEADED Offline
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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
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RyanY Online Content
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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
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MolaKule Offline
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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
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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
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DONWATERS Offline
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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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