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Re: Switch to High Mileage Oil or No? [Re: Blake1107] #5242948 10/18/19 05:31 AM
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ka9mnx Offline
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HM oil (M1 HM 10w-30) completely stopped a rear main seal seep I had in my 250k, 26 year old, F150.


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: Switch to High Mileage Oil or No? [Re: ka9mnx] #5242957 10/18/19 05:39 AM
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billt460 Offline
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Originally Posted by ka9mnx
HM oil (M1 HM 10w-30) completely stopped a rear main seal seep I had in my 250k, 26 year old, F150.

That gives me encouragement. I'll keep using and hoping with my fingers crossed. How many miles did it take to get the results you speak of?

Re: Switch to High Mileage Oil or No? [Re: csandste] #5242962 10/18/19 05:45 AM
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Mackelroy Offline
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Originally Posted by csandste
I've put high mileage oil in relatively new cars and then switched again. So not to worry. High mileage oils perform just fine and the contain conditioners, not swellers.



They do the exact same thing, they soften and swell rubber, one word is just less frightening


My experience, don't use seal agents unless necessary and willing to take on the risk.

Ive ran motors temporarily using hm oil with no ill effect, Ive installed in motors where created a leak, its a crap shoot, avoid unless needed and willing to risk..

Last edited by Mackelroy; 10/18/19 05:49 AM.
Re: Switch to High Mileage Oil or No? [Re: Mackelroy] #5242975 10/18/19 06:01 AM
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billt460 Offline
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Originally Posted by Mackelroy
Originally Posted by csandste
I've put high mileage oil in relatively new cars and then switched again. So not to worry. High mileage oils perform just fine and the contain conditioners, not swellers.

They do the exact same thing, they soften and swell rubber, one word is just less frightening My experience, don't use seal agents unless necessary and willing to take on the risk.

Ive ran motors temporarily using hm oil with no ill effect, Ive installed in motors where created a leak, its a crap shoot, avoid unless needed and willing to risk..

So...... If there is a risk and a downside, what is it? How does this stuff generate leaks, if that's what it's supposed to prevent?????

Re: Switch to High Mileage Oil or No? [Re: Blake1107] #5242978 10/18/19 06:10 AM
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JohnnyJohnson Offline
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Off and on when I find an HM oil on a very good sale I use it. It has never caused an issue with my 2004 Corolla going back and forth. In just a couple weeks I'm going back on Pennzoil 5W-20 PUP for my October change. Why because it was $14 and change for a 5 quart Jug yes and 1 0ut of 3 times I finally got a rebate from Shell. So my next OCI with filter is going to cost me $6.85. That is as good a reason as I need for using HM oil. Your car and it becomes your choice go for the $50 boutique oil if you really think it buys you something.

Last edited by JohnnyJohnson; 10/18/19 06:19 AM.

2004 Corolla 139013
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: Switch to High Mileage Oil or No? [Re: Blake1107] #5242984 10/18/19 06:19 AM
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Mad_Hatter Offline
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Originally Posted by SubieRubyRoo
Originally Posted by billt460
I'm beginning to think "High Mileage" oil is somewhat of a snake oil. I'll only add that I would love to be proven wrong about this.


MolaKule has gone on the record stating that high mileage oils generally have a more robust antioxidant package than a non-hi-mi version, along with other "good" stuff (usually extra detergents and seal conditioners). He even said it may be preferable to run high-mileage oil from day one to maximize its benefits; and considering that 99% of the time, the high-mileage version is the same cost as the "regular" version, what downside is there?

+1
Ppl think a HiMi is some exotic formula but in fact it's more similar to the plain formula than it is different. As you pointed out it's more "robust"..more or better seal conditioning agents, usually higher ppm total of AW additives and dispersants/detergents. Some HiMi formulas even have higher than avg TBNs, presumably to combat the blow by that older engines experience.

In short there is nothing in a HiMi formula that is going to grenade your engine or existing seals or as I've suggested before, oil mfgs a) wouldn't be recommending it for even new engines and b) would have to slap a disclaimer on the bottle saying "Do Not Use Unless Your Seals Are Leaking".😉.. and fwiw, asking a seal conditioner to stop an already blown out seal is a tall order which it may or may not be able to do depending on the size of the leak..they (sca's) work best prophylactically - preventing the seal from becoming dried out and cracking to begin with.

One might ask, "how does a seal become dried out in an engine"?.. indeed a good question, over time varnish and sludge can coat a seal preventing it from being exposed to the lubricants conditioners..in time that seal can shrink and crack..so the detergents in a HiMi are designed to clean out that sludge and varnish so the leaking seal can once again be exposed to the SCA's.. this process can take some time; several thousand miles.

Re: Switch to High Mileage Oil or No? [Re: Mackelroy] #5242988 10/18/19 06:23 AM
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Mad_Hatter Offline
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Originally Posted by Mackelroy

My experience, don't use seal agents unless necessary and willing to take on the risk.
..

What if I told you that all finished lubes have seal conditioners?🤔

Re: Switch to High Mileage Oil or No? [Re: Mad_Hatter] #5243001 10/18/19 06:35 AM
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JohnnyJohnson Offline
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Originally Posted by Mad_Hatter
Originally Posted by Mackelroy

My experience, don't use seal agents unless necessary and willing to take on the risk.
..

What if I told you that all finished lubes have seal conditioners?🤔


LOL now was that nice you just rained on someone's TGIF doom a glum day. crackmeup

Last edited by JohnnyJohnson; 10/18/19 06:35 AM.

2004 Corolla 139013
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: Switch to High Mileage Oil or No? [Re: JohnnyJohnson] #5243005 10/18/19 06:40 AM
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Mad_Hatter Offline
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Originally Posted by JohnnyJohnson
Originally Posted by Mad_Hatter

What if I told you that all finished lubes have seal conditioners?🤔

LOL now was that nice you just rained on someone's TGIF doom a glum day. crackmeup

shrug coffee

Last edited by Mad_Hatter; 10/18/19 06:40 AM.
Re: Switch to High Mileage Oil or No? [Re: Mad_Hatter] #5243047 10/18/19 07:11 AM
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billt460 Offline
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Originally Posted by Mad_Hatter
One might ask, "how does a seal become dried out in an engine"?.. indeed a good question, over time varnish and sludge can coat a seal preventing it from being exposed to the lubricants conditioners. in time that seal can shrink and crack..so the detergents in a HiMi are designed to clean out that sludge and varnish so the leaking seal can once again be exposed to the SCA's.. this process can take some time; several thousand miles.

What if you changed oil and filter religiously to prevent sludge buildup? There isn't anything for HM oil to, "clean up". No sludge or varnish, but yet you still have a leak. Now what? The HM oil isn't going to accomplish anything, because you don't have the crap in your engine the stuff is supposed to remove.

Re: Switch to High Mileage Oil or No? [Re: Blake1107] #5243102 10/18/19 08:02 AM
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CT8 Offline
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Marketing is wonderful !!! It really works.


2015 F150 2.7
2018 F350 6.2
Re: Switch to High Mileage Oil or No? [Re: billt460] #5243106 10/18/19 08:05 AM
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Mad_Hatter Offline
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Originally Posted by billt460

What if you changed oil and filter religiously to prevent sludge buildup? There isn't anything for HM oil to, "clean up". No sludge or varnish, but yet you still have a leak. Now what? The HM oil isn't going to accomplish anything, because you don't have the crap in your engine the stuff is supposed to remove.

Changing the oil and filter religiously doesn't guarantee you won't have any sludge or varnish.

Sludge and varnish is but one concern, warping of metal like on valve covers can cause failure of the oil seal system. Pitting (due to acids) or burrs on the crankshaft can wear on the softer seals causing them to leak. Engines that run hotter than normal can also decrease the mtbf of a seal. Point is, there are a number of reasons why seals fail...I mentioned just one reason, that a HiMi formula can help with. Whether you choose to accept that it's a "thing" is up to you but it doesn't change the fact that it's a legitimate cause of seal failure.

And fwiw, the higher levels of AW additives found in a HiMi formula is reason enough for many, like myself, to use it. But hey.. this is America.. don't let me stop you from doing you.😉


*my post was not meant to be an exhaustive review of oil seal failures. Feel free to PM if you want to discuss further.

Last edited by Mad_Hatter; 10/18/19 08:20 AM.
Re: Switch to High Mileage Oil or No? [Re: billt460] #5243161 10/18/19 09:05 AM
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ka9mnx Offline
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Originally Posted by billt460
How many miles did it take to get the results you speak of?

500 to 800 miles.


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: Switch to High Mileage Oil or No? [Re: Blake1107] #5243336 10/18/19 11:57 AM
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Tdog02 Offline
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It won't be a problem. Try 5w30 in that F150 and use the same for your wife's car. Simplify your life and don't look back. You could use supertech if you wanted, or any SN+ oil should do nicely for both vehicles.


09 Venza 2.7 114k 5w-30 Qsud
16 F150 2.7TT 71k 5w-30 Magnatec
Re: Switch to High Mileage Oil or No? [Re: Blake1107] #5243382 10/18/19 12:42 PM
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benjy Offline
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HM oils are said to cut leakage as it did on my aunts 99 jeep cherokee + they generally are on the higher end of their viscosity spread. running most any cheaper group III synthetic @ $5 + or - a qt in 5 qt containers 5-30 would be beneficial, if you see leakage use a 5-30 HM fake synthetic!!

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