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Okay to suddenly abandon Hi-Mi oil? #5335919 01/29/20 08:37 PM
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jayjr1105 Offline OP
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My van, the 05 Odyssey in my sig, is very much used to hi-mi 0w20 or 5w20. I can't remember the last time I used a regular non-high mileage oil, probably at least 4 years.

Not that I mind using hi-mi oil but my stash right now is overflowing with non-himi 5w30 and 0w20 full synthetic oils (RGT, M1, ProDS, etc). I have this fear that if I abandon Hi-Mi formulas now, that seals will slowly lose their "swollen" effect and I'll start to see some seepage.


2013 Mazda 3 - PP 0w20
2005 Honda Odyssey - PP HM 5w20
Re: Okay to suddenly abandon Hi-Mi oil? [Re: jayjr1105] #5335926 01/29/20 08:42 PM
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PowerSurge Offline
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Use your stash and then add a little AT-205 Re-Seal to the oil.

Re: Okay to suddenly abandon Hi-Mi oil? [Re: jayjr1105] #5335927 01/29/20 08:42 PM
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JohnnyJohnson Offline
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Only your Odyssey can tell you the truth!


2004 Corolla 138781
Out: Havoline Pro DS 10w-30 Purolator PureOne 10-29-19 136457
In: Pennzoil Platinum HM 5W-20 ST 4386
2006 Duramax 77060
Out: T6 5W-40 XG9100 73909
In: Rotella Dino PH9100 11-3-19
Re: Okay to suddenly abandon Hi-Mi oil? [Re: jayjr1105] #5335947 01/29/20 09:01 PM
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Mad_Hatter Offline
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I go back and forth all the time between HiMi and vanilla flavor.. there's no big puddle of oil in my driveway. A bad seal is a bad seal no matter the type of lube used.

Fwiw...

https://www.bobistheoilguy.com/forums/ubbthreads.php/ubb/printthread/Board/1/main/269105/type/thread

Last edited by Mad_Hatter; 01/29/20 09:04 PM.
Re: Okay to suddenly abandon Hi-Mi oil? [Re: jayjr1105] #5336024 01/29/20 11:34 PM
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Marco620 Offline
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Lots of luck with Liquimoly Motor Oil Saver. You could use it and see if it seals in.If so, micro dose use the next time after and if it dry discontinue afterward.


15' Civic 1.8 i-vtec 308,000 mi M1 0w30 & LG Biotech, BP CVT Fluid,GUMOUT W/ PEA
Doberman Whisperer!
E pluribus unum.

Re: Okay to suddenly abandon Hi-Mi oil? [Re: Mad_Hatter] #5336050 01/30/20 01:03 AM
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Dave9 Offline
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Originally Posted by Mad_Hatter
I go back and forth all the time between HiMi and vanilla flavor.. there's no big puddle of oil in my driveway. A bad seal is a bad seal no matter the type of lube used.


That is misleading. If you have a bad seal, that is a legitimate use of a hi-mi oil with seal swellers. If you don't have a bad seal, or every other seal that wasn't bad, is degraded from seal swellers and wears faster from being introduced to them. Seal swellers will make a good seal wear out faster. This bears repeating. Seal sweller will make a good seal wear out faster.

So, have the good seals worn out to the point where they leak now without the seal conditioner? The only way to know is to try it, and they will be swollen a while after introducing regular oil, but eventually, you will have more leaks from having used the high milesage oil with seal swellers than if you never did, so once that becomes problematic you'll want to switch back to using HM oil with seal swellers.

The best advice is, do not use high mileage oil with seal swellers until it's necessary to seal, and do not switch back because you've compromised all your seals by using it. Going back and forth is the worst thing you could do, and yet, engines are pretty robust and survive despite this mistreatment. They just don't survive as long as if you'd never done it.

The OP has a very legitimate concern and should stick with the high mileage oil. A stash of oil is worth nothing compared to the aggravation dealing with burning or leaking, fouling cats or O2 sensors, spark plugs, etc.


Last edited by Dave9; 01/30/20 01:05 AM.
Re: Okay to suddenly abandon Hi-Mi oil? [Re: Dave9] #5336061 01/30/20 01:57 AM
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GMBoy Online Content
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Originally Posted by Dave9
Originally Posted by Mad_Hatter
I go back and forth all the time between HiMi and vanilla flavor.. there's no big puddle of oil in my driveway. A bad seal is a bad seal no matter the type of lube used.


That is misleading. If you have a bad seal, that is a legitimate use of a hi-mi oil with seal swellers. If you don't have a bad seal, or every other seal that wasn't bad, is degraded from seal swellers and wears faster from being introduced to them. Seal swellers will make a good seal wear out faster. This bears repeating. Seal sweller will make a good seal wear out faster.

So, have the good seals worn out to the point where they leak now without the seal conditioner? The only way to know is to try it, and they will be swollen a while after introducing regular oil, but eventually, you will have more leaks from having used the high milesage oil with seal swellers than if you never did, so once that becomes problematic you'll want to switch back to using HM oil with seal swellers.

The best advice is, do not use high mileage oil with seal swellers until it's necessary to seal, and do not switch back because you've compromised all your seals by using it. Going back and forth is the worst thing you could do, and yet, engines are pretty robust and survive despite this mistreatment. They just don't survive as long as if you'd never done it.

The OP has a very legitimate concern and should stick with the high mileage oil. A stash of oil is worth nothing compared to the aggravation dealing with burning or leaking, fouling cats or O2 sensors, spark plugs, etc.




Your logic seems on point in relation to seal swellers such as what is in oil stop leak products. However, hi mileage oils claim to not use seal swellers but rather seal "conditioners". Are they the same additives but different names? I don't know but I don't think they have enough additive to do much so switching back and forth probably won't be an issue. Of course, a damaged seal makes no difference - that needs to be fixed. I don't start using a hi mileage until closer to 100k miles because I would rather not deal with replacing seals if I can help it. Not sure if the HM loil actually helps but I have 2 vehicles that have been on M1 HM oils and are leak free. My personal view is once you go to HM you should probably stay with them but if the OP has a big oil stash I am sure running the regular oil in between HM oils should pose no issues.

Last edited by GMBoy; 01/30/20 01:58 AM.
Re: Okay to suddenly abandon Hi-Mi oil? [Re: jayjr1105] #5336083 01/30/20 04:10 AM
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tblt44 Offline
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I e mailed valvoline on there HM oil years ago, they said there is more seal conditioners in there HM oils. They said they don't use seal swellers


2003 Avalanche Z71 5.3
2006 Tahoe 5.3
1989 Yamaha moto 4 250
2004 Key Largo w/70 Yamaha 2 stroke
Re: Okay to suddenly abandon Hi-Mi oil? [Re: jayjr1105] #5336098 01/30/20 05:35 AM
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Mad_Hatter Offline
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Originally Posted by Dave9
That is misleading. If you have a bad seal, that is a legitimate use of a hi-mi oil with seal swellers. If you don't have a bad seal, or every other seal that wasn't bad, is degraded from seal swellers and wears faster from being introduced to them. Seal swellers will make a good seal wear out faster. This bears repeating. Seal sweller will make a good seal wear out faster.

This is a false statement. Show me one bit of scientific evidence, not anecdotal, that supports your claim.

Use of a HiMi oil isn't going to degrade a good engine seal. Seal conditioning agents (SCA's) don't attack and breakdown natural and synthetic rubbers like a solvent might. Seal conditioners act much in the same way a salve for your skin does, it restores elasticity and to a very small degree volume. The effect on a good seal is to keep it from drying out. Fact is, most every major oil mfg produces a HiMi formula and recommends use of their HiMi formulas in engines of all ages, including new(er) engines. See attachments.

Like I said, I have nearly 170k on the original valve stem seals and main seals with no leaks/burning, and I regularly go back and forth between HiMi and vanilla. I guess I'm waiting for this "degradation" effect to which you speak of?🤔 So if you do know something about seal conditioners that ExxonMobil or Chevron doesn't, please share. (and fwiw many of these companies, like Chevron & XOM, have guarantees warrantying against any lubricant related failures)

Valvoline MaxLife..
[Linked Image]

Mobil 1...Mobil 1 Link
[Linked Image]


Chevron Havoline HiMi...(will not void mfg warranty)
[Linked Image]

Last edited by Mad_Hatter; 01/30/20 05:42 AM.
Re: Okay to suddenly abandon Hi-Mi oil? [Re: jayjr1105] #5336109 01/30/20 06:10 AM
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ka9mnx Offline
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This post is exactly why I don't "stash" oil.


2005 Ranger 3.0 - SuperTech Syn 5w-30/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: Okay to suddenly abandon Hi-Mi oil? [Re: ka9mnx] #5336285 01/30/20 09:51 AM
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Triple_Se7en Offline
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Originally Posted by ka9mnx
This post is exactly why I don't "stash" oil.

I keep a two year supply...... about 8-9 five quart jugs. Only keep one year supply of oil filters..... I believe it's 2 or 3 currently.

If I were that heavy into High Mileage oil, covering many years, I wouldn't abandon it.... not without a good reason.
Building regular oil ''stash'', due to fantastic buys out there these days, is arguably a good reason..... if money's tight these days.

If money is not a reason, then the health & welfare of the vehicle's future must be good.... like getting a clean bill of health from the family doctor.

Last edited by Triple_Se7en; 01/30/20 10:03 AM.

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19' Hyundai Santa Fe 2.4 GDI / 20' Kia Soul XLine 2.0 MPI - both Pennzoil Ultra Platinum 5W30 Mobil1 Filters



Re: Okay to suddenly abandon Hi-Mi oil? [Re: jayjr1105] #5336353 01/30/20 11:10 AM
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DGXR Offline
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Since the OP wants to use more of his non-HM stash, I would mix the HM with non-HM in equal parts at the next oil change. Dip a toe in, see how it goes.


1995 Corvette coupe LT1 6-speed
2006 Tacoma 2.7 Base SR5 AC
1999 Yamaha YZ400FL
2003 Honda XR400R
Re: Okay to suddenly abandon Hi-Mi oil? [Re: jayjr1105] #5336365 01/30/20 11:31 AM
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jayjr1105 Offline OP
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Wrong thread, oops.

Last edited by jayjr1105; 01/30/20 11:46 AM.

2013 Mazda 3 - PP 0w20
2005 Honda Odyssey - PP HM 5w20
Re: Okay to suddenly abandon Hi-Mi oil? [Re: jayjr1105] #5336531 01/30/20 03:42 PM
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sleepery Offline
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I alternated high mileage synthetic 5w30 and conventional non-high mileage 5w30 for a few years in my 99 Explorer . I did not encounter any problems with leaks or consumption .

Re: Okay to suddenly abandon Hi-Mi oil? [Re: tblt44] #5336543 01/30/20 03:52 PM
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wdn Offline
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Posting advertising fluff like it is gospel is not scientific evidence. Posting your own anecdote to counter another member’s anecdote is not scientific evidence either.

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