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Best oil additive to stop engine knock? #5462961 06/26/20 01:47 AM
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Dogred08 Offline OP
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I have a push mower that I got for free that smokes a little and knocks when it runs. What additive would help with both? I was considering either the grey high mileage stop or blue regular bottle stp oil additive since it's super cheap and really thick and has good reviews. Are there any other additives that might be better?

GREY STP High Mileage Oil Treatment + Stop Leak, 15 fl. oz.

http://www.walmart.com/ip/STP-High-Mileage-Oil-Treatment-Stop-Leak-15-fl-oz/19897926

BLUE STP Oil Treatment, 15 fluid ounces, 8262, Oil Additives

http://www.walmart.com/ip/STP-Oil-Treatment-15-fluid-ounces-8262-Oil-Additives/16817398

Re: Best oil additive to stop engine knock? [Re: Dogred08] #5462964 06/26/20 01:55 AM
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340_Magnum Offline
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Have you considered just running a heavier oil in it? I had an old Cub Cadet lawn tractor that smoked and was a little noisy so I just ran 20w-50 conventional in it. It still used a little oil but ran decent.

Re: Best oil additive to stop engine knock? [Re: Dogred08] #5462967 06/26/20 02:28 AM
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Char Baby Offline
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I once got a lawnmower for free and it too knocked. Turned out it was the blade hitting a piece of the deck that had bent underneath. I'm sure this isn't your particular issue but, check underneath anyway. Pull the head and check that everything is moving smoothly and the spark plug is good. Then use a thicker oil instead of additives to thicken oil.


Retired 6 yrs now & lovin' it
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Best oil additive to stop engine knock? [Re: Char Baby] #5462973 06/26/20 03:09 AM
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Dogred08 Offline OP
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This is a cheap flathead push mower and it only had a few oz of oil in it when I got it so ik it has to be something internal

Re: Best oil additive to stop engine knock? [Re: 340_Magnum] #5462974 06/26/20 03:10 AM
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Dogred08 Offline OP
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For me additives are cheaper but is heavy oil better? Btw this is a low end flat head cheap push mower nothing special.

Re: Best oil additive to stop engine knock? [Re: Dogred08] #5462984 06/26/20 04:15 AM
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dlundblad Offline
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I’d check and/ or replace the spark plug.

Maybe give the engine a sea foam treatment too?


03 Jeep WJ 4.0 208k
02 Volvo S60 2.4T 199k
97 Chevy Blazer 4.3 175k
04 Audi A4 3.0 210k

Re: Best oil additive to stop engine knock? [Re: Dogred08] #5462992 06/26/20 04:45 AM
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Lubener Offline
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Use a heavier oil like 20w-50 and run it till the rod snaps in two. You might be surprised how long it will go before that happens.

Last edited by Lubener; 06/26/20 04:45 AM.

The "thinking" man's friend.
Re: Best oil additive to stop engine knock? [Re: Dogred08] #5463004 06/26/20 05:44 AM
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Char Baby Offline
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Originally Posted by Dogred08
For me additives are cheaper but is heavy oil better? Btw this is a low end flat head cheap push mower nothing special.


Yeah, I understand! smile
Yes, heavier oil is cheaper especially when changing the oil. Is it better? Well, today's oils are better!

Mowers generally don't require much oil to perform well. I mean, if oil is on the dipstick at all, your usually OK! I don't think a full crank case will help with the knocking. But, please keep is posted if it does.

I'm just babbling here but:
Lots of people buy the oil and then also buy the additive too! frown
Additives generally just make your oil thicker with very little benefit(if any) in terms of their own additives/ingredient package. Typically, they just don't have much in terms of their ingredients(additives). Maybe some extra Zinc? IDK!

STP, Lucas and the like, are really nothing special but thick(er) oils made from low(er) grade oils such as Group I. Whereas, today's oils are Group II, Group II+ & Group III. Which is why most of these products are labeled as "Snake Oil"(nothing special).

With these "Snake Oil" products, all your doing is making your oil thicker when you can just buy thicker oil and spend the money once. That's all I'm saying. wink

But yes I understand. If you are just adding some oil product to the mower's engine(not changing the oil) then, STP(or whatever) maybe the the least costly way to add oil volume and thicken it up as well.

Why the engine is knocking? Who knows!

Good Luck. I love free stuff!

CB

Last edited by Char Baby; 06/26/20 05:46 AM.

Retired 6 yrs now & lovin' it
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Best oil additive to stop engine knock? [Re: Dogred08] #5463027 06/26/20 06:29 AM
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demarpaint Offline
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When I worked selling cars we had a manager who would check out trades and was clueless when it came to checking out an engine or transmission. He took a few gems with knocks. Service would notify him of his screw up, and the cost for the repair. There were quite a few of these gems wholesaled with a quart or more of Lucas swill in the sump.


God Bless Our Troops

Re: Best oil additive to stop engine knock? [Re: Dogred08] #5463028 06/26/20 06:31 AM
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joekingcorvette Offline
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I would save my money and not buy a costly additive. Just put a thick oil 40W or thicker and see how long it runs.


2005 Chevrolet Corvette
2014 Ford F-150 4x4 supercrew
2014 Jeep Grand Cherokee Limited (wifes)
2012 Honda Civic 4 door (my daily driver)
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Re: Best oil additive to stop engine knock? [Re: Dogred08] #5463040 06/26/20 06:58 AM
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Astro14 Offline
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Define “knock”...


32 Packard 15W40
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02 Volvo V70 XC 0W40 Edge
05 MB S600 0W40 M1
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Re: Best oil additive to stop engine knock? [Re: Dogred08] #5463050 06/26/20 07:08 AM
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userfriendly Offline
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The sound a free lawnmower makes when you throw it in a dumpster,

Re: Best oil additive to stop engine knock? [Re: Dogred08] #5463061 06/26/20 07:20 AM
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sloinker Offline
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I think all the thick oil additives are about the same. Buy what is cheapest per ounce. Motor Honey haz a nice ring to it.

Re: Best oil additive to stop engine knock? [Re: Dogred08] #5463063 06/26/20 07:25 AM
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SatinSilver Offline
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I would use all blue STP treatment in the sump at this point. I’m not a thickie either since I’ve been running Ow20 in a car for the last 8 years.

Re: Best oil additive to stop engine knock? [Re: Dogred08] #5463067 06/26/20 07:31 AM
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ARCOgraphite Offline
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NO additives. NO Gear oil.

SAE 30 or 40 HD

then throw it away

cause soon it will blow.

Maybe


2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#9 70254mi-Rotella
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