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When to use High Mileage Oil? #4803306
07/02/18 02:59 PM
07/02/18 02:59 PM
Joined: Dec 2017
Posts: 10
Indiana
ddhmax1973 Offline OP
ddhmax1973  Offline OP

Joined: Dec 2017
Posts: 10
Indiana
I would like to understand when and why it would be a good decision to start using high mileage oil instead of non high mileage oil. This would be for all types of motor oil: synthetic, conventional, and synthetic blend.
What additive package elements are used to make an oil a high mileage oil?
If my vehicle is mainly used as a commuter (work) vehicle, at what mileage should I start to consider high mileage oil?
Should high mileage oils be used or not used in high performance engines?
Are there any risks using synthetic high mileage oil for extended oil changes( 10k miles)?

Re: When to use High Mileage Oil? [Re: ddhmax1973] #4803314
07/02/18 03:22 PM
07/02/18 03:22 PM
Joined: Aug 2012
Posts: 169
Central Florida
StevieBoy Offline
StevieBoy  Offline

Joined: Aug 2012
Posts: 169
Central Florida
Synthetic is always better IMHO. Unless you ask some of the hi-thrift folks on this site. grin High milage oils have more additives to help the seals stay effective. You may never need hmo if the seals don't leak. (Little or no oil puddles underneath where you park.) I believe the age of the vehicle would determine the need for hmo more so than the miles. Extended oil changes should not be a problem with hmo synthetic any more than any good synthetic.


2018 Grand Cherokee Limited
25th Anniversary Sterling Edition
Re: When to use High Mileage Oil? [Re: ddhmax1973] #4803331
07/02/18 03:56 PM
07/02/18 03:56 PM
Joined: Jun 2016
Posts: 3,715
MN
oil_film_movies Online content
oil_film_movies  Online Content

Joined: Jun 2016
Posts: 3,715
MN
StevieBoy is right about the seals issue. High Mileage oils mainly have a little extra seal conditioners to keep seals from getting too brittle with age.
Thats about it, and a lot of marketing of course, but High Mileage oils are for real.

Mobil recently added the Mobil 1 Extended Performance High Mileage oil to their product line, and its good for 1 year or 15,000 miles, to answer your question, ddhmax1973, about going a long time between changes. That oil should do it, since their EP line has always had some PAO and pretty good anti-oxidants in it to support longer intervals.

I did see a video a while back from Valvoline's (MaxLife High Mileage oil) tech labs where they did say that "seal conditioners" were the main point, but they also load up their MaxLife oils with some other goodies. My guess is the extra goodies don't amount to much over non-HM oils, but the seal conditioning is decent.

Its my opinion that you can make any non-HM oil an "HM" oil by adding half a bottle of LiquiMoly Motor Oil Saver (amazon or NAPAautoparts), a good seal conditioner to tweak the formula slightly.

What miles to start using it? 75,000 miles is recommended. Its not a bad guess. Valvoline did say they picked that for their MaxLife products because they observed seals starting to get brittle about then.

Last edited by oil_film_movies; 07/02/18 03:58 PM.
Re: When to use High Mileage Oil? [Re: ddhmax1973] #4803346
07/02/18 04:23 PM
07/02/18 04:23 PM
Joined: Jun 2014
Posts: 2,892
Phoenix, Arizona - USA
SirTanon Online content
SirTanon  Online Content

Joined: Jun 2014
Posts: 2,892
Phoenix, Arizona - USA
In all honesty, at least the way I see it, a person could start using High Mileage oil from the very start, and see a benefit. If the extra additives in the HMO help to condition the seals and keep them from getting brittle, wouldn't they conceivably provide that benefit even earlier and help the seals that much more?

It would be one thing if the HM oils were more expensive than just plain conventional, but really, they're not... okay, maybe a dollar or two per jug, but that's small potatoes compared to the overall price.

IMHO, worth it.


2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 270,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 62,000mi
Re: When to use High Mileage Oil? [Re: ddhmax1973] #4803348
07/02/18 04:25 PM
07/02/18 04:25 PM
Joined: May 2018
Posts: 656
South Carolina
ka9mnx Online content
ka9mnx  Online Content

Joined: May 2018
Posts: 656
South Carolina
I use HM oil and not for the seal conditioners. Although it can't hurt. I replace oil seals that go bad. I use HM oil because the ones I use are ACEA A3 which is what my old junks need. The oils today are great for newer vehicles but not so for older ones. ILSAC oils are especially bad for old engines. I have tried every brand and spec oil in my old junks and they run the best on the A3 (HM) oil. They ran OK on ILSAC oils, just better on A3. Smoother, quieter and even better gas mileage, which I watch very closely. I'm not a fan of HDEO oils because I'm pleased the results of the HM oils. I'm also not a fan of oil additives.

Last edited by ka9mnx; 07/02/18 04:26 PM.

2005 Ranger 3.0 - M1 HM 5w-30/Motorcraft - (85+K)
2000 4Runner 3.4 - M1 HM 10w-30/Toyota - (250+K)
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar - (175+K)
1993 F150 4.9 - M1 HM 10w-30/Motorcraft - (250+K)
Re: When to use High Mileage Oil? [Re: ddhmax1973] #4803366
07/02/18 04:37 PM
07/02/18 04:37 PM
Joined: Jul 2016
Posts: 1,775
Jacksonville, FL
FlyNavyP3 Online content
FlyNavyP3  Online Content

Joined: Jul 2016
Posts: 1,775
Jacksonville, FL
My 30 year old 4Runner doesn't use or leak oil, has been serviced at 3,000-5,000 intervals with primary conventional oils. Max Life is great oil and produces good UOA but I'm not sure that there is a mileage or age that it's required or desired. I'm motoring along with over 337,250 miles on plain old conventional and not leaking a drop.


Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander
Re: When to use High Mileage Oil? [Re: ddhmax1973] #4803377
07/02/18 04:44 PM
07/02/18 04:44 PM
Joined: Mar 2012
Posts: 1,440
San Antonio, TX
E150GT Offline
E150GT  Offline

Joined: Mar 2012
Posts: 1,440
San Antonio, TX
I use it if the flavor I want is in stock when I need it. If not,I dont. This is in all my vehicles.


1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 57k 10w30
2006 Buick Lucerne CXL 3.8 31k 5w30
Re: When to use High Mileage Oil? [Re: FlyNavyP3] #4803395
07/02/18 05:01 PM
07/02/18 05:01 PM
Joined: Mar 2015
Posts: 5,782
Virginia
bbhero Online sick
bbhero  Online Sick

Joined: Mar 2015
Posts: 5,782
Virginia
Yeah FlyNavy I bet the seal leaking may well be due to oil that gets acidic and tears up the seals. By your typical regimen that oil never got acidic therefore it has not developed a leak. Just like my Altima 3.5 VQ with 234k miles.

There's nothing g wrong with high mileage oils. I have run Valvoline Maxlife Full Synthetic a time or two. I liked it quite a lot. My car runs very quiet on it. Some VQ motors have a valvetrain tick. With Valvoline Maxlife Full Synthetic is was totally quiet. There are other oils that have done just about as well as the VMFS.


Nissan Altima 3.5 Coupe
Mobil Super 5w30 Wix 57356
"Treat your family like your friends and treat your friends like your family."
Re: When to use High Mileage Oil? [Re: ddhmax1973] #4803402
07/02/18 05:19 PM
07/02/18 05:19 PM
Joined: Jun 2002
Posts: 3,536
Chattanooga, TN
Spector Offline
Spector  Offline

Joined: Jun 2002
Posts: 3,536
Chattanooga, TN
If it ain't broke why fix it?? If the vehicle is not consuming oil or seeping oil IMO there is absolutely no reason to switch to a HM oil.

Re: When to use High Mileage Oil? [Re: ddhmax1973] #4803408
07/02/18 05:27 PM
07/02/18 05:27 PM
Joined: Mar 2008
Posts: 7,749
USA
slacktide_bitog Offline
slacktide_bitog  Offline

Joined: Mar 2008
Posts: 7,749
USA
When it's on sale smile

Re: When to use High Mileage Oil? [Re: ddhmax1973] #4803426
07/02/18 05:47 PM
07/02/18 05:47 PM
Joined: Aug 2004
Posts: 366
San Diego
FlyPenFly Offline
FlyPenFly  Offline

Joined: Aug 2004
Posts: 366
San Diego
When you do have a leaky engine, HM is amazing at sealing up those leaks.

However, if you ever go back to non HM oil, it'll probably start leaking again. I don't think HM actually restores or repairs anything, it just makes your seals bloat a bit to keep everything a bit more sealed up. Everyone says its not harmful though but I would only use it as a cheap fix for a leaky engine that isn't worth rebuilding.


2014 Mercedes GLK350 3.5L DFI
2014 Mercedes E350 Coupe 3.5L DFI
2010 Audi A4 2.0T
Re: When to use High Mileage Oil? [Re: FlyPenFly] #4803434
07/02/18 05:56 PM
07/02/18 05:56 PM
Joined: Jun 2016
Posts: 3,715
MN
oil_film_movies Online content
oil_film_movies  Online Content

Joined: Jun 2016
Posts: 3,715
MN
Originally Posted By: FlyPenFly
When you do have a leaky engine, HM is amazing at sealing up those leaks. However, if you ever go back to non HM oil, it'll probably start leaking again. I don't think HM actually restores or repairs anything, it just makes your seals bloat a bit to keep everything a bit more sealed up. Everyone says its not harmful though but I would only use it as a cheap fix for a leaky engine that isn't worth rebuilding.


You're confusing "seal sweller" chemicals for "seal conditioners". For example, Valvoline Maxlife Full Synthetic is dexos1 qualified, meaning they test that High Mileage oil against about 10 different seal materials to make sure it doesn't swell or shrink the seals much. That's an actual test in SN and many other oil specs too. Conclusion: No, its a myth that HM oils will "swell" your seals excessively.

Re: When to use High Mileage Oil? [Re: oil_film_movies] #4803445
07/02/18 06:10 PM
07/02/18 06:10 PM
Joined: Feb 2009
Posts: 1,729
wv
krismoriah72 Offline
krismoriah72  Offline

Joined: Feb 2009
Posts: 1,729
wv
A few years ago the high mileage oils had higher detergents and zddp.. but the recent voas i have seen they are cutting back.

In a nutshell high mileage oils should have high detergents to get rid of varnish and sludge and prevent more with looser tolerances and blowby. ZDDP for extra cushion against wear doesnt hurt either.

In todays time the 5w40 HDEOs have just about everything you need to keep an older engine clean...but high mileage oils arent what they used to be IMHO.

Re: When to use High Mileage Oil? [Re: ddhmax1973] #4803455
07/02/18 06:20 PM
07/02/18 06:20 PM
Joined: Jan 2009
Posts: 14,100
Illinois
tig1 Online content
tig1  Online Content

Joined: Jan 2009
Posts: 14,100
Illinois
My 2007 Ford Fusion has 227K all on 0-20. No leaks,


2007 Ford Fusion 237,000 miles
M1 0-20 EP
2017 Ford Fusion 64K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and Valvoline LV
M1 10-30 in all OPE
MC filters

Re: When to use High Mileage Oil? [Re: oil_film_movies] #4803472
07/02/18 06:44 PM
07/02/18 06:44 PM
Joined: Dec 2004
Posts: 1,019
Florida /Texas
Mackelroy Offline
Mackelroy  Offline

Joined: Dec 2004
Posts: 1,019
Florida /Texas
Originally Posted By: oil_film_movies
Originally Posted By: FlyPenFly
When you do have a leaky engine, HM is amazing at sealing up those leaks. However, if you ever go back to non HM oil, it'll probably start leaking again. I don't think HM actually restores or repairs anything, it just makes your seals bloat a bit to keep everything a bit more sealed up. Everyone says its not harmful though but I would only use it as a cheap fix for a leaky engine that isn't worth rebuilding.


You're confusing "seal sweller" chemicals for "seal conditioners". For example, Valvoline Maxlife Full Synthetic is dexos1 qualified, meaning they test that High Mileage oil against about 10 different seal materials to make sure it doesn't swell or shrink the seals much. That's an actual test in SN and many other oil specs too. Conclusion: No, its a myth that HM oils will "swell" your seals excessively.


Seal conditioner is just a more politically correct version of seal swell agents , I don't differentiate between the two.

Ive also seen Mobil1 hm oil, soften and swell valve cover gaskets( and begin leaks) and oil filter gaskets that are near gooey and bloated on removal, to where the gasket just pops out of the oil filter upon removal. Some motors its not an issue, others you may have just created a leak.

Seal conditioners = soften and Bloating, should be expected

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