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Any reason not to use high mileage formula oil? #5218692 09/21/19 10:03 AM
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jimbrewer Offline OP
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Car carefully maintained and now out of warranty. 80,000 miles. No sludge issues.

Any reason not to use high mileage formulation of my favorite oil?

Re: Any reason not to use high mileage formula oil? [Re: jimbrewer] #5218697 09/21/19 10:08 AM
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ka9mnx Online Content
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No


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: Any reason not to use high mileage formula oil? [Re: jimbrewer] #5218700 09/21/19 10:11 AM
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CT8 Online Content
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I ran high mile oil a few times on my 2015 F150 when it was new, no problem running the oils. Marketing really works.


2015 F150 2.7
2018 F350 6.2
Re: Any reason not to use high mileage formula oil? [Re: jimbrewer] #5218704 09/21/19 10:14 AM
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Warstud Offline
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I wouldn't use the oils with the seal swellers unless you have leaks. But the oils with the conditioners would be ok.

Re: Any reason not to use high mileage formula oil? [Re: Warstud] #5218726 09/21/19 10:33 AM
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jimbrewer Offline OP
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Originally Posted by Warstud
I wouldn't use the oils with the seal swellers unless you have leaks. But the oils with the conditioners would be ok.


How do you know which is which? I’m thinking of using Mobil 1EP based on some of the excellent reports I’ve seen here .

Re: Any reason not to use high mileage formula oil? [Re: jimbrewer] #5218729 09/21/19 10:35 AM
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D1dad Offline
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I’ll let ya know. I’ve got some valvoline 0-20 maxlife synthetic going into the wifes 2018 rogue. If it blows and they deny the warranty then we will know lol.

Re: Any reason not to use high mileage formula oil? [Re: jimbrewer] #5218737 09/21/19 10:44 AM
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Chris142 Online Content
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Originally Posted by jimbrewer
Originally Posted by Warstud
I wouldn't use the oils with the seal swellers unless you have leaks. But the oils with the conditioners would be ok.


How do you know which is which? I’m thinking of using Mobil 1EP based on some of the excellent reports I’ve seen here .

I would like to know too. My Jeep has started using and leaking oil. Currently running Napa high milage in it.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Any reason not to use high mileage formula oil? [Re: Warstud] #5218748 09/21/19 10:54 AM
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Mad_Hatter Offline
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Originally Posted by Warstud
I wouldn't use the oils with the seal swellers unless you have leaks. But the oils with the conditioners would be ok.

I'm pretty sure all oils contains seal conditioning agents (SCA) to mitigate hardening. Seal sweller is SCA, SCA is "seal sweller". I believe, but I might be wrong on this part, SCA's are esters??🤔...SCA's essentially allow hardened, shrunken seals to return to their normal shape and size. And with respect to SCA's, I believe the difference between a HiMi formula and your run of the mill formula is the amount and type (there can be compatibility issues amongst the different grp oils) of SCA's in the finished lube.

Last edited by Mad_Hatter; 09/21/19 10:59 AM.
Re: Any reason not to use high mileage formula oil? [Re: jimbrewer] #5218758 09/21/19 11:03 AM
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paulri Offline
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Every time I've looked at an oil company website for their answer to this, they have stated that there is absolutely no harm in using a HM oil in a new/newish car.

Because my cars are well into the 100K range, I use it when I can get it for the same price as nonHM oil. Usually when Wm has a line of oil on rollback, it all goes to the same price. But I wouldn't pay a buck more for a 5 quart jug for the HM difference. I'm sure there is some difference, just not sure how much.

Last edited by paulri; 09/21/19 11:03 AM.

2005 Toyota Sienna LE; 163,000 miles
2006 Toyota Highlander Hybrid 118,000 miles
Re: Any reason not to use high mileage formula oil? [Re: CT8] #5218761 09/21/19 11:08 AM
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ka9mnx Online Content
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Marketing works and so do HM oils. Reducing oil consumption (piston rings) and eliminating rear seal seepage. Marketing and HM works for me!


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: Any reason not to use high mileage formula oil? [Re: jimbrewer] #5218859 09/21/19 01:12 PM
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danez_yoda Offline
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if there is no reason to use it i would not bother. If thats all they had on the shelf, i would not have a secnd thought about using it.

Re: Any reason not to use high mileage formula oil? [Re: jimbrewer] #5218864 09/21/19 01:17 PM
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loub Offline
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Originally Posted by jimbrewer
Originally Posted by Warstud
I wouldn't use the oils with the seal swellers unless you have leaks. But the oils with the conditioners would be ok.


How do you know which is which? I’m thinking of using Mobil 1EP based on some of the excellent reports I’ve seen here .

I'm using Mobil1EP 0w20 in my 2016 Outback, can someone explain to me what the EP Extended Performance is supposed to achieve, other than longer OCI' s?

Re: Any reason not to use high mileage formula oil? [Re: jimbrewer] #5218934 09/21/19 03:23 PM
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Dave9 Offline
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If you are not losing oil due to seal shinkage or wear, a HM oil with a seal conditioner that swells them more than their already acceptable amount, will only wear them faster and should be avoided.

It's not "any reason not to" so much as don't use HM oil unless you have a reason to. An engine with no problems should continue using the same high quality oil you would have used. Mileage cannot predict the HM oil need, some engines last many more miles than others plus there is the driving environment, whether they were easy highway miles or short trips and/or temperature extremes.

HM oil does nothing useful for a properly working engine (and exhaust). If it did, they'd put the same additives in all their oil.

Re: Any reason not to use high mileage formula oil? [Re: jimbrewer] #5218968 09/21/19 03:57 PM
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wemay Offline
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Perfectly safe to use. If it's a current API oil, it must fall within API SN parameters in order to meet that spec. And if it does, it's perfectly safe for use in any modern vehicle, new or high mileage.


2018 KIA Sportage LX 2.4 AWD
GTX Magnatec 5W20, Purolator PL14459

2013 Hyundai Santa Fe Sport 2.0T
GTX Magnatec 5W30, OEM
Re: Any reason not to use high mileage formula oil? [Re: Dave9] #5219109 09/21/19 07:05 PM
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Originally Posted by Dave9
If you are not losing oil due to seal shinkage or wear, a HM oil with a seal conditioner that swells them more than their already acceptable amount, will only wear them faster and should be avoided.

It's not "any reason not to" so much as don't use HM oil unless you have a reason to. An engine with no problems should continue using the same high quality oil you would have used. Mileage cannot predict the HM oil need, some engines last many more miles than others plus there is the driving environment, whether they were easy highway miles or short trips and/or temperature extremes.

HM oil does nothing useful for a properly working engine (and exhaust). If it did, they'd put the same additives in all their oil.

Rubber seals can and do get brittle, crack and shrink over the course of tens of thousands of miles. The idea is to PREVENT a leak, not try and fix one after it's occurred. At that point you're asking a lot of a HiMi formula to undo years of neglect and the window of opportunity to stay or undo the effects of time, has essentially closed on you. In that case you can't blame the HiMi formula for not being able to undo the fallout of your poor choices. There was a time when you could do something about it, now it's too late.😉

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