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Can a "High Mileage" oil help reduce blowby? #5029602
03/02/19 09:20 PM
03/02/19 09:20 PM
Joined: Jul 2018
Posts: 42
Southern California, USA
slickoil Offline OP
slickoil  Offline OP

Joined: Jul 2018
Posts: 42
Southern California, USA
Can a "High Mileage" oil help reduce blowby? Vehicle is a 2010 Toyota Prius with ~146K, if that matters.

Re: Can a "High Mileage" oil help reduce blowby? [Re: slickoil] #5029610
03/02/19 09:28 PM
03/02/19 09:28 PM
Joined: Aug 2011
Posts: 668
GoVols
kstanf150 Offline
kstanf150  Offline

Joined: Aug 2011
Posts: 668
GoVols
No

Re: Can a "High Mileage" oil help reduce blowby? [Re: slickoil] #5029623
03/02/19 09:39 PM
03/02/19 09:39 PM
Joined: Apr 2004
Posts: 9,427
Pensacola & Vero Beach FL
ekpolk Offline
Global Moderator
ekpolk  Offline
Global Moderator

Joined: Apr 2004
Posts: 9,427
Pensacola & Vero Beach FL
Maybe, and only indirectly, not inherently because they're "high mileage" oils. Many of the HM oils have viscosities toward the higher end of the spec range for a particular grade, compared to their non-HM siblinigs. Vanilla M1 5w-30 is 11.0 cSt whereas the M1-HM flavor of 5w-30 is 12.1 cSt (hot of course). To the extent that the higher vis might reduce blow by, then again, maybe.

All that said, if blow by has become an issue, for whatever reason, your problems are probably greater than that which might be addressed by tinkering with oil selection.

Last edited by ekpolk; 03/02/19 09:40 PM.

18 Prius Two-Eco (L-Ion Batt), Mag Grey, 4000 miles (M1 AFE 0W-20).
07 Avalon XLS, Cassis Pearl, only 70k miles (M1 EP 5w-30).
04 Prius, Black, 200k miles (M1 EP 5w-30). 2006-2019 --RIP 😥
Re: Can a "High Mileage" oil help reduce blowby? [Re: slickoil] #5029639
03/02/19 09:56 PM
03/02/19 09:56 PM
Joined: Sep 2005
Posts: 6,490
MIchigan
Warstud Offline
Warstud  Offline

Joined: Sep 2005
Posts: 6,490
MIchigan
Not gonna help much but since your in SC you could just go with a thicker oil.

Re: Can a "High Mileage" oil help reduce blowby? [Re: ekpolk] #5029647
03/02/19 10:04 PM
03/02/19 10:04 PM
Joined: Aug 2011
Posts: 668
GoVols
kstanf150 Offline
kstanf150  Offline

Joined: Aug 2011
Posts: 668
GoVols
High mileage oil is nothing more than good marketing

Re: Can a "High Mileage" oil help reduce blowby? [Re: slickoil] #5029673
03/02/19 10:49 PM
03/02/19 10:49 PM
Joined: Dec 2004
Posts: 7,403
beaver land EH?
Quest Offline
Quest  Offline

Joined: Dec 2004
Posts: 7,403
beaver land EH?
what makes you think you have a blowby issue?


"Internet discussion boards act as echo chambers for conspiracy dittoheads" A.Allen
Re: Can a "High Mileage" oil help reduce blowby? [Re: kstanf150] #5029680
03/02/19 11:01 PM
03/02/19 11:01 PM
Joined: May 2005
Posts: 4,940
SF Bay Area
y_p_w Offline
y_p_w  Offline

Joined: May 2005
Posts: 4,940
SF Bay Area
Originally Posted by kstanf150
High mileage oil is nothing more than good marketing

Darn you to heck MaxLife!!!

Actually I remember when MaxLife and many of the copycat high mileage motor oils came out they didn't have the API EOLCS donut. They might have even fudged a bit where they couldn't meet the standard, but these days they formulate something that does.

Re: Can a "High Mileage" oil help reduce blowby? [Re: slickoil] #5029716
03/03/19 12:17 AM
03/03/19 12:17 AM
Joined: Jan 2018
Posts: 1,196
San Antonio, TX
das_peikko Offline
das_peikko  Offline

Joined: Jan 2018
Posts: 1,196
San Antonio, TX
Blow-by has always been reduced with thick oil. Thick oil is harder to get past the piston rings and into the combustion chamber.

Re: Can a "High Mileage" oil help reduce blowby? [Re: slickoil] #5029808
03/03/19 05:19 AM
03/03/19 05:19 AM
Joined: Jul 2005
Posts: 32,530
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 32,530
NY
Possibly.


God Bless Our Troops

Re: Can a "High Mileage" oil help reduce blowby? [Re: slickoil] #5029978
03/03/19 10:19 AM
03/03/19 10:19 AM
Joined: Apr 2018
Posts: 642
south dakota
joekingcorvette Offline
joekingcorvette  Offline

Joined: Apr 2018
Posts: 642
south dakota
I have had high mileage vehicles but never thought I had the need to a high mileage oil. I doubt if it will help your problem.


2005 Chevrolet Corvette
2014 Ford F-150 4x4 supercrew
2014 Jeep Grand Cherokee Limited (wifes)
2012 Honda Civic 4 door (my daily driver)
2007 Lund Tyee Grand Sport Mercury 115HP 9.8HP
Re: Can a "High Mileage" oil help reduce blowby? [Re: slickoil] #5030020
03/03/19 11:10 AM
03/03/19 11:10 AM
Joined: Aug 2010
Posts: 1,756
pa
benjy Offline
benjy  Offline

Joined: Aug 2010
Posts: 1,756
pa
HM oil worked for me! aunts 1999 jeep was leaking quite a bit but after 2 changes, 6 mo intervals its getting better. on a similar note girlfriends DI 2.5 LS malibu cut consumption in half with a euro spec 5-40 compared to a 10-30 + don't even mention the spec 20 than ran thru it when new. all oils fake group III synthetic.

Re: Can a "High Mileage" oil help reduce blowby? [Re: y_p_w] #5030098
03/03/19 12:03 PM
03/03/19 12:03 PM
Joined: Jul 2005
Posts: 11,802
Maricopa Arizona
dave1251 Offline
dave1251  Offline

Joined: Jul 2005
Posts: 11,802
Maricopa Arizona
Originally Posted by y_p_w
Originally Posted by kstanf150
High mileage oil is nothing more than good marketing

Darn you to heck MaxLife!!!

Actually I remember when MaxLife and many of the copycat high mileage motor oils came out they didn't have the API EOLCS donut. They might have even fudged a bit where they couldn't meet the standard, but these days they formulate something that does.



Yeah most were thicker and had a bit more additives. QS Defy was one who had more ZDDP at API SL levels during the SN era.


make the inside of your engine oil cap white.
don't use.
Re: Can a "High Mileage" oil help reduce blowby? [Re: benjy] #5030103
03/03/19 12:05 PM
03/03/19 12:05 PM
Joined: Jul 2005
Posts: 11,802
Maricopa Arizona
dave1251 Offline
dave1251  Offline

Joined: Jul 2005
Posts: 11,802
Maricopa Arizona
Originally Posted by benjy
HM oil worked for me! aunts 1999 jeep was leaking quite a bit but after 2 changes, 6 mo intervals its getting better. on a similar note girlfriends DI 2.5 LS malibu cut consumption in half with a euro spec 5-40 compared to a 10-30 + don't even mention the spec 20 than ran thru it when new. all oils fake group III synthetic.



Once again what does it matter about "fake" group III synthetic do you live in the Artic and Pennsylvania is cold it's not the Artic.


make the inside of your engine oil cap white.
don't use.
Re: Can a "High Mileage" oil help reduce blowby? [Re: Quest] #5030295
03/03/19 03:17 PM
03/03/19 03:17 PM
Joined: Jul 2018
Posts: 42
Southern California, USA
slickoil Offline OP
slickoil  Offline OP

Joined: Jul 2018
Posts: 42
Southern California, USA
Originally Posted by Quest
what makes you think you have a blowby issue?


The Toyota Prius is consuming about 1QT of oil every 750miles. This is a known issue with the 2010-2014 Toyota Prius. The fix recommended by Toyota (replacing the piston rings) costs over $1500, so that's not an affordable possibility unless Toyota pays for it (working on getting that to happen).

It hasn't been confirmed to be a blowby issue (not sure how to verify that for sure), but since there is a known issue with the Toyota Prius, and the symptoms match, it's the most likely culprit.

Re: Can a "High Mileage" oil help reduce blowby? [Re: Warstud] #5030311
03/03/19 03:30 PM
03/03/19 03:30 PM
Joined: May 2002
Posts: 21,858
Oakville, Ontario
Patman Offline
Global Moderator
Patman  Offline
Global Moderator

Joined: May 2002
Posts: 21,858
Oakville, Ontario
Originally Posted by Warstud
Not gonna help much but since your in SC you could just go with a thicker oil.



I agree.

I think HM oils are a waste of shelf space. If someone has a higher mileage engine that's burning more oil than they are comfortable with, just move to a thicker viscosity.


2018 Corvette, 13k, M1 ESP Formula 5w30 & NAPA Gold
2006 Civic EX Coupe, 151k, PUP 5w20 & Fram Ultra
2010 BMW 328i X-Drive,116k, GC 0w40 & Fram Ultra

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