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#2295770 - 06/23/11 12:36 PM Engine Blow By
chevman4life Offline


Registered: 05/18/11
Posts: 204
Loc: TX
Just curious but I heard a lot of people talk about "blow by" in an engine and I understand how it occurs, but what are ways to slow it down? I've heard people say to run 15w40 etc. What are ya'lls thoughts? Or a high Moly oil, which now what Dino oils are high in Moly?
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1982 Chevy C10, 212k
1988 Buick Estate Wagon
2005 Ford Mustang V6, 136k, Amsoil 10W30
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#2295774 - 06/23/11 12:40 PM Re: Engine Blow By [Re: chevman4life]
kemo Offline


Registered: 03/14/11
Posts: 356
Loc: MN, USA
you can't really "slow it down". At that point, it is time to start looking for a new ride, a new engine, or parts to rebuild it.

But I guess that's just me, I'd rather fix the problem ASAP rather than play the odds that are against me.
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#2295792 - 06/23/11 01:00 PM Re: Engine Blow By [Re: chevman4life]
chevman4life Offline


Registered: 05/18/11
Posts: 204
Loc: TX
Good point. Some close friends have a 2000 Ford Winstar and at around 150k it started having slight blow by, he was told to try a HM oil and add Lucas Oil Stabilizer. I remember him telling me that he hadn't noticed anymore issues with it, and since then they have put over 50k on it. His wife still drives it everyday with over 200k. I guess it depends on how bad it is.
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1982 Chevy C10, 212k
1988 Buick Estate Wagon
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2016 Traverse

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#2295799 - 06/23/11 01:04 PM Re: Engine Blow By [Re: chevman4life]
Chris142 Offline


Registered: 06/05/03
Posts: 13971
Loc: apple valley, ca
All engines have some blow by. As wear increases so does blow by. Using thicker oil wont do much to improve things.
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87 F250 delo 15w40
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#2295803 - 06/23/11 01:07 PM Re: Engine Blow By [Re: Chris142]
lexus114 Offline


Registered: 05/12/08
Posts: 6137
Loc: Easton, PA
Originally Posted By: Chris142
All engines have some blow by. As wear increases so does blow by. Using thicker oil wont do much to improve things.


It help`s some. Buy`s some time if nothing else.


Edited by lexus114 (06/23/11 01:10 PM)
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#2295815 - 06/23/11 01:20 PM Re: Engine Blow By [Re: chevman4life]
JHZR2 Offline



Registered: 12/14/02
Posts: 38250
Loc: New Jersey
Lots of diesels have substantial blowzy and still run well. In a gasser, no such luck. If it's bad, look for a new engine.

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#2295829 - 06/23/11 01:41 PM Re: Engine Blow By [Re: chevman4life]
RegDunlop Offline


Registered: 11/12/10
Posts: 219
Loc: NYC NY USA
Can somebody explain "blowby?"

What causes it?

How do you know, what are indications it is occurring?

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#2295833 - 06/23/11 01:47 PM Re: Engine Blow By [Re: RegDunlop]
440Magnum Offline


Registered: 02/01/09
Posts: 8233
Loc: Texas
Originally Posted By: RegDunlop
Can somebody explain "blowby?"

What causes it?

How do you know, what are indications it is occurring?



"Blow by" refers to combustion gasses escaping past the rings and into the crankcase. ALL piston engines have blow-by, that's what the PCV valve and plumbing is for- to suck it away and burn it before it creates excessive deposits in the engine (and the EPA likes it because it keeps it out of the air, too).

Blow-by tends to decrease as a new engine breaks in, then slowly increase again as an engine wears out. It is only "excessive" when the volume of blow-by is more than the PCV system can remove. You know this because the engine starts venting vapor out the oil fill hole at idle (a visible grey mist when you run the engine with the oil fill cap off) and/or soaking the air filter with oil mist that gets pushed out the crankcase air inlet pipe that usually attaches to the air intake plumbing.
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#2295853 - 06/23/11 02:21 PM Re: Engine Blow By [Re: chevman4life]
VR1 Offline


Registered: 06/19/11
Posts: 132
Loc: North Texas
like stated above engine is showing its age but, I woudn't run a thicker oil or stabilizers it will not help a thing and actually cause more wear in other parts of your engine like bearings etc. Trying a high mileage is a good choice to help with it some but, use your recomended grade. Thats about all you can do until its rebuild time.
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#2295861 - 06/23/11 02:31 PM Re: Engine Blow By [Re: chevman4life]
crw Offline


Registered: 05/31/05
Posts: 1695
Loc: Pocatello, ID
For what it's worth, the 1.5L Mazda I have... we bought it with 147K... some time after that I realize that the engine has significant blow by... But I keep up with it, change the oil and add more when it burns off, the engine is now at 175K and still going fine. Yes, it would have been better if the PO hadn't neglected it, but if I can get it to 200K I'll consider it good.
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#2295916 - 06/23/11 03:49 PM Re: Engine Blow By [Re: chevman4life]
tig1 Offline


Registered: 01/03/09
Posts: 11433
Loc: Illinois
Excessive blow by can be caused by actual cyl wall and ring wear, or in most cases,I believe, may be caused by ring coking from oil change abuse where the rings coke solid and can't expand to the cyl wall as designed with carbon from oil that is way pasted it prime. Synthetic oil can help prevent this. I have done 10K OCIs for many years and have never experienced ring coking with synthetic oil.
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#2296003 - 06/23/11 05:26 PM Re: Engine Blow By [Re: chevman4life]
demarpaint Offline


Registered: 07/03/05
Posts: 25350
Loc: NY
If the rings are sticking and causing the blow-by an engine cleaning product like Kreen "could" help. Please note the word "could" help, MMO "could" as well it just takes longer. When using one of these products just keep on eye on the oil level because it could drop faster with the addition of either product. If the blow-by is caused by wear Schaeffers #132 might help.
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#2296212 - 06/23/11 09:18 PM Re: Engine Blow By [Re: 440Magnum]
TFB1 Offline


Registered: 09/03/10
Posts: 3495
Loc: VA
Originally Posted By: 440Magnum
It is only "excessive" when the volume of blow-by is more than the PCV system can remove. You know this because the engine starts venting vapor out the oil fill hole at idle (a visible grey mist when you run the engine with the oil fill cap off) and/or soaking the air filter with oil mist that gets pushed out the crankcase air inlet pipe that usually attaches to the air intake plumbing.


Bingo and even engines with excessive blowby can run tens of thousands miles as long as they are closely maintained... Mainly with this condition it's important to keep the oil fresh, as the blowby will quickly shear the oil and worsen the issue or possibly lead to additional problems... Of course most are going to take the attitude, it already has problems, why bother with a regular OCI...

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#2296214 - 06/23/11 09:21 PM Re: Engine Blow By [Re: chevman4life]
hattaresguy Offline


Registered: 06/01/11
Posts: 7180
Loc: CT
It doesn't really mean a whole lot as long as the engine runs well. Their are a lot of low compression older motors out their still chugging along.

Oil has very little to do with it, its wear. The only fix is a rebuild.


Edited by hattaresguy (06/23/11 09:22 PM)

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#2296253 - 06/23/11 09:54 PM Re: Engine Blow By [Re: hattaresguy]
SL2 Offline


Registered: 02/19/09
Posts: 458
Loc: Upstate, NY
Originally Posted By: hattaresguy
It doesn't really mean a whole lot as long as the engine runs well. Their are a lot of low compression older motors out their still chugging along.

Oil has very little to do with it, its wear. The only fix is a rebuild.


Such as my 226K mile buick century with its 1/2 shot burnt/chipped valves..
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