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HM from the start? #5357447 02/22/20 05:00 PM
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AJB0009 Offline OP
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One discussion that I have never seen presented (I may, of course, just missed it): Why not run HM oils right from the start?
It seems that many here are fans of HM oils. If the makers of these oil say they help to condition seals to prevent them from leaking, and help prevent deposits and sludge from forming, help to keeps engines cleaner, etc., etc. Why wait?
I mean, if a person goes out and spends a ton of money on a new vehicle, they should run regular oil for the first 75k miles; and the seals will begin to harden, sludge and deposits will begin to form in the engine, etc., then after 75k miles a person should switch to a HM oil to fix all of the problems that have begun to develop?
This really doesn't pertain to me, as every vehicle that own has over 100k miles on it, but I have never heard this brought up before.
Thanks all.


13 Toyota Corolla S 1.8
12 Ford Fusion 2.5
06 Toyota Tacoma 2.7
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Re: HM from the start? [Re: AJB0009] #5357450 02/22/20 05:05 PM
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RoadDukie Offline
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AJB0009, That's a very interesting question! It made me go: Humm?
I look forward to hearing the opinions of the forum.


1998 Mercedes S500
2003 Corvette Roadster
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Re: HM from the start? [Re: AJB0009] #5357458 02/22/20 05:19 PM
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2dogs Offline
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Valvoline says you can use their HM oil in newer cars. Don't know about the other brands.

https://www.valvoline.com/recommend...83756996.1582397268-360720773.1582397268


Drop down/expand the high mileage header if you're interested.

Re: HM from the start? [Re: AJB0009] #5357464 02/22/20 05:30 PM
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NH73 Offline
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Pretty much all oil companies says you can use HM oil from the beginning. The 75,000 mile is just there for marketing. As long as the oil meets the manufacturer specs, I don't see that there is anything wrong using it from the start.


2017 Toyota RAV4 Hybrid
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Re: HM from the start? [Re: AJB0009] #5357470 02/22/20 05:37 PM
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OilOfIndia Offline
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Very good question. I was wondering about the same. Not I have a follow-up question. Can you use HM oil once in a while? Meaning switch back and forth between Hm and non-HM oil? Some threads I got an impression that once you start using HM, you have to continue using it.

Re: HM from the start? [Re: AJB0009] #5357484 02/22/20 05:56 PM
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Eddie Offline
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Since new seals are a required a specific durometer, I think a high mileage oil that is stated to soften seals may lower the durometer too much.I think I will just use the standard oil for the first 75K miles. Ed


2014 CX5 Touring 2.5L :-)
Re: HM from the start? [Re: AJB0009] #5357499 02/22/20 06:17 PM
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Jetsfan421 Offline
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I know someone personally that used hm quaker state in a 2000 Grand am 2.4L the majority of it's life that ran like a top and didn't leak or use any between changes until it was destroyed by a truck texting and driving. Mileage was 185k when it got hit and scrapped.

Re: HM from the start? [Re: AJB0009] #5357505 02/22/20 06:34 PM
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Dave9 Online Content
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Don't. Seal swellers (dubiously called conditioners) are meant to increase the size of the seal to make up for wear, while necessarily decreasing its density so it wears that much faster. Using one then switching back to non-HM oil can make the leak worse than if you'd never used it.

If this was beneficial for new engines, it wouldn't be called high mileage oil, but consider that engines now last a long longer than they used to. 75K miles decades ago is more like double that today.

I'd never use it at any engine mileageunless I had unacceptable oil loss and as a last ditch effort to keep it running a bit longer while I contemplated what to do next (unless it was a rarely used vehicle).



Last edited by Dave9; 02/22/20 06:36 PM.
Re: HM from the start? [Re: AJB0009] #5357506 02/22/20 06:35 PM
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Duffyjr Online Content
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I think most guys here only use it to try a fix a leaking issue and not as a preventative like it's intended/marketed to be used. I'm seriously thinking of switching to Valvoline HM soon in my Lucerne.


89 GMC Sierra Advanced 5w30/51036 Wix
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Re: HM from the start? [Re: Dave9] #5357509 02/22/20 06:38 PM
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tundraotto Offline
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Originally Posted by Dave9
Don't. Seal swellers (dubiously called conditioners) are meant to increase the size of the seal to make up for wear, while necessarily decreasing its density so it wears that much faster. Using one then switching back to non-HM oil can make the leak worse than if you'd never used it.

If this was beneficial for new engines, it wouldn't be called high mileage oil, but consider that engines now last a long longer than they used to. 75K miles decades ago is more like double that today.

I'd never use it at any engine mileageunless I had unacceptable oil loss and as a last ditch effort to keep it running a bit longer while I contemplated what to do next (unless it was a rarely used vehicle).




^this - 100%
if it aint broke - dont try fixing it.

Re: HM from the start? [Re: AJB0009] #5357513 02/22/20 06:42 PM
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Dave9 Online Content
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^^ It's not a preventative, rather the opposite it stops leaks at the expense of seal swelling to do so. If the manufacturer felt that larger, lower density seals were an improvement, that's what they would've used in the engine in the first place.

Last edited by Dave9; 02/22/20 06:46 PM.
Re: HM from the start? [Re: AJB0009] #5357529 02/22/20 07:04 PM
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Used on low mileage cars and switched back and forth. Don't think it makes much difference. Mostly marketing hype although there might be raised conditioners, that's not the same as swellers. Can't change my own oil. Used to have coupons for $10 extra for MaxLife, now it's three or four times as much. Back to VWB with no probs.


2017 Kia Soul+ Valvoline Daily Protection 5w30+ a bit of Harvest King syn 5w30-- 75,000 miles
Re: HM from the start? [Re: AJB0009] #5357535 02/22/20 07:19 PM
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oldhp Offline
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Mix in a quart each oil change. Shouldn't hurt anything.


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Re: HM from the start? [Re: AJB0009] #5357562 02/22/20 07:59 PM
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This has been kicked around numerous time here and as far as I can remember it’s been just talk. Nobody has offered any hard evidence that HM oils really do much of anything other than make oil companies big money.

Re: HM from the start? [Re: Dave9] #5357579 02/22/20 08:26 PM
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Mad_Hatter Offline
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Originally Posted by Dave9
Don't. Seal swellers (dubiously called conditioners) are meant to increase the size of the seal to make up for wear, while necessarily decreasing its density so it wears that much faster. Using one then switching back to non-HM oil can make the leak worse than if you'd never used it.

If this was beneficial for new engines, it wouldn't be called high mileage oil, but consider that engines now last a long longer than they used to. 75K miles decades ago is more like double that today.

I'd never use it at any engine mileageunless I had unacceptable oil loss and as a last ditch effort to keep it running a bit longer while I contemplated what to do next (unless it was a rarely used vehicle).



That's hogwash..if anything you said was true, oil mfgs would have to slap a big RED warning sign on HiMi bottles to CYA themselves. Anecdotally, I've got nearly 170k miles on my engine and from day one I've switched back and forth from HiMi to vanilla. In fact I've got RGT in the sump right now and prior to that I ran Havoline HiMi syn blend and prior to that Kendall GT1 and after this run of RGT I plan on using M1 HiMi. I guess I should expect my engine seals to grenade any day now according to you! LOL..oh, and at 170k miles of going back and forth, I don't burn a lick of oil that I can discern between oil changes. 5.5 goes in.. and 5k miles later apprx 5.5 comes out.

Last edited by Mad_Hatter; 02/22/20 08:32 PM.
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