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#4548179 - 10/19/17 11:29 AM Seal Swell Testing Video
Solarent Offline

Registered: 10/24/11
Posts: 945
Loc: Toronto ON

I sometimes get asked how seal swell agents work and while doing some research on the topic, I came across this video from Lubrizol which shows how an oil's impact on seals is evaluated. The test shown here isn't the only one used, but it is one of the main ones.

Basically after being exposed to oil after a long period of time (a week at elevated temperature), the seal coupon is stretched to see if it has changed since new. High Mileage engine oils contain ingredients designed to soften older and harder elastomers and bring them back to similar levels of performance to new material using what is shown in these tests to evaluate the performance.

Hope you like the video as much as I did!

#4548206 - 10/19/17 11:50 AM Re: Seal Swell Testing Video [Re: Solarent]
StevieC Offline

Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Thanks thumbsup
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

#4548256 - 10/19/17 12:26 PM Re: Seal Swell Testing Video [Re: Solarent]
wemay Offline

Registered: 04/04/12
Posts: 8898
Loc: Southeast Florida
Very nice! Thanks. Interesting that almost all brands now recommend their HM oils for new vehicles as well.
2017 Hyundai Sonata Sport 2.4L
2013 Hyundai Santa Fe Sport 2.0T

#4548381 - 10/19/17 02:28 PM Re: Seal Swell Testing Video [Re: Solarent]
OneEyeJack Offline

Registered: 09/14/10
Posts: 7479
Loc: S California
I can't see changing to a HM oil regardless of mileage if there are no apparent problems. What's working should be left alone. There are those that must really abuse their vehicles for there to be a suggestion that 75K miles equates to high mileage. My 03 V8 4Runner is at 165K+ miles with no indication of excessive oil consumption or seals leaking. That's more than double this 75K cutoff and this engine works hard for its living.

#4548427 - 10/19/17 03:25 PM Re: Seal Swell Testing Video [Re: Solarent]
ARB1977 Offline

Registered: 06/12/05
Posts: 5170
Loc: North Texas
Cool video. Makes me feel even better about HM oils.
2015 Tacoma 4.0L 60K (as of 02/23/18)
Amsoil SS 0W30 / Toyota filter

2018 CRV 1.5L (as of 05/11/18)
Factory fill / Factory filter

#4548477 - 10/19/17 04:28 PM Re: Seal Swell Testing Video [Re: Solarent]
69GTX Offline

Registered: 09/23/15
Posts: 3815
Loc: Connecticut
My car only has 78K miles. But being 16 years old, so are the seals and gaskets. I'm going to start making the move to a HM oil next year. There is some oil weepage (no dripping).

2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs

#4548536 - 10/19/17 05:37 PM Re: Seal Swell Testing Video [Re: Solarent]
FlyPenFly Offline

Registered: 08/04/04
Posts: 250
Loc: San Diego
Are the active mechanisms in HM oil different than AT-205?

From what I recall, HM swells seals and if you stop using HM it goes back to original. With AT-205 it's an additive product that restores material onto seals?
2014 Mercedes GLK350 3.5L DFI
2014 Mercedes E350 Coupe 3.5L DFI
2007 Suzuki Grand Vitara 2.7L V6

#4549194 - 10/20/17 11:45 AM Re: Seal Swell Testing Video [Re: Solarent]
BrocLuno Online   content

Registered: 09/06/15
Posts: 5528
Loc: Kalifornia Kollective
Once softened, they may slowly go back as you use non-HM oils, but it is not an over night process ...

But once you need HM oils, why go back?
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

#4549310 - 10/20/17 02:19 PM Re: Seal Swell Testing Video [Re: Solarent]
EricBeau Offline

Registered: 07/16/17
Posts: 91
Loc: Sauk Valley, IL
Very interesting. Iíve got some PPHM 0W-20 about to go in my Odyssey, and I have MaxLife 5W-30 in my Camry. Both are are high mileage vehicles and I like the idea of HM oils. Iíll stick with them going forward.
2001 Toyota Camry LE 4cyl.
Valvoline MaxLife 5W-30 blend and FRAM PH4967

2010 Honda Odyssey LX
Valvoline MaxLife 5W-20 blend and FRAM TG7317

Ford Service Advisor