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0w30 instead of 5w30 rod knock gone #3982310
01/18/16 02:52 AM
01/18/16 02:52 AM
Joined: Jan 2016
Posts: 22
WA
fuzzysig Offline OP
fuzzysig  Offline OP

Joined: Jan 2016
Posts: 22
WA
why does it work?

tried on 4 different motors b and d series Honda.
switched from mobil1 5w30 to mobil1 0w30 and knock is gone even at cold start...
drove the cars for months after daily and no rod knock
and the engine feels smoother to my ear at least

Re: 0w30 instead of 5w30 rod knock gone [Re: fuzzysig] #3982315
01/18/16 03:03 AM
01/18/16 03:03 AM
Joined: Aug 2009
Posts: 2,276
PA
Gasbuggy Offline
Gasbuggy  Offline

Joined: Aug 2009
Posts: 2,276
PA
You have 4 motors with rod knock?


Cadillac CTS-V 6.2L 10w30PP
Volvo P1800 5w30 Euro L
LR Series III 10w40 VWB
76' 300D Edge 0w40
02 Yukon 10w30 PP
10 Charger Pursuit 5.7L
95 Accord - 386k. Mobil 2 RIP
Re: 0w30 instead of 5w30 rod knock gone [Re: fuzzysig] #3982332
01/18/16 03:26 AM
01/18/16 03:26 AM
Joined: Nov 2015
Posts: 1,462
KingCake Offline
KingCake  Offline

Joined: Nov 2015
Posts: 1,462
spoiler: it wasn't rod knock

Re: 0w30 instead of 5w30 rod knock gone [Re: fuzzysig] #3982340
01/18/16 03:50 AM
01/18/16 03:50 AM
Joined: Jul 2013
Posts: 1,764
Laramie, WY
01_celica_gt Offline
01_celica_gt  Offline

Joined: Jul 2013
Posts: 1,764
Laramie, WY
there is no way a "rod knock" is fixed with different motor oil, if there is a "rod knock" then the bearing wear is too great and even thicker oils won't really come close to solving this "rod knock" of yours, and no you didn't have a rod knock if oil fixed it.


Red 01 Celica GT 1ZZ-FED(Rebuilt @ 211) @ 230k
Red 02 Corolla S 1ZZ-FED(Rebuilt @ 140k) @ 141k
All Autos!
Re: 0w30 instead of 5w30 rod knock gone [Re: Gasbuggy] #3982386
01/18/16 07:24 AM
01/18/16 07:24 AM
Joined: Jul 2005
Posts: 31,715
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 31,715
NY
Originally Posted By: Gasbuggy
You have 4 motors with rod knock?


+1


God Bless Our Troops

Re: 0w30 instead of 5w30 rod knock gone [Re: fuzzysig] #3982387
01/18/16 07:25 AM
01/18/16 07:25 AM
Joined: Feb 2008
Posts: 6,367
Midwest
Pop_Rivit Offline
Pop_Rivit  Offline

Joined: Feb 2008
Posts: 6,367
Midwest
Motor oil doesn't fix rod knocks.

Re: 0w30 instead of 5w30 rod knock gone [Re: Gasbuggy] #3982397
01/18/16 07:45 AM
01/18/16 07:45 AM
Joined: Jan 2016
Posts: 226
Coast to coast, USA
Brasileno Offline
Brasileno  Offline

Joined: Jan 2016
Posts: 226
Coast to coast, USA
Originally Posted By: Gasbuggy
You have 4 motors with rod knock?


He has me beat.. LOL

Originally Posted By: fuzzysig
why does it work?

tried on 4 different motors b and d series Honda.
switched from mobil1 5w30 to mobil1 0w30 and knock is gone even at cold start...
drove the cars for months after daily and no rod knock
and the engine feels smoother to my ear at least



Oh, brother.

It's not rod knock, it's a typewriter sound... right?

Re: 0w30 instead of 5w30 rod knock gone [Re: Pop_Rivit] #3982439
01/18/16 09:11 AM
01/18/16 09:11 AM
Joined: Apr 2008
Posts: 13,206
Central NY
Miller88 Offline
Miller88  Offline

Joined: Apr 2008
Posts: 13,206
Central NY
Do they use hydraulic lifters? I could see maybe a 0w-30 pumping up a worn out lifter quicker than a conventional 5w-30. My Cherokee lost a bit of top end noise of some sort when I ran a 5w-30/20 mix in it.

But it wasn't a rod knock


Originally Posted By: Pop_Rivit
Motor oil doesn't fix rod knocks.


I think some 85w-140 would clear up a bit of noise! haha. Then it would probably spin a bearing from the 140 not flowing at all!


18 Forester 2.5I 6M
00 Jeep XJ
01 F-350 4x4 5M
Re: 0w30 instead of 5w30 rod knock gone [Re: fuzzysig] #3982453
01/18/16 09:34 AM
01/18/16 09:34 AM
Joined: Mar 2010
Posts: 100
Everywhere
AndyinAL Offline
AndyinAL  Offline

Joined: Mar 2010
Posts: 100
Everywhere
Just to satisfy my own curiosity, I hope there is a board member on here that can tell us what exactly this noise is. A had a 1995 Civic with a d16 that made an awful noise when cold but was dead silent after it was up to temp. I adjusted the valves and ruled them out. I knew it wasnt valves anyway because this noise was only UNDER LOAD. I just always let it warm up several minutes and never had any issues. I sold it to a buddy for cheap and he drove it for years with never an issue but the noise was always there. Dead silent at normal operating temp. I know it has to be piston slap or rod bearings on the high end of tolerance but never knew for sure. It sure wasn't worth tearing into just for curiosity. This was a 1995 d16 SOHC. D16Z6 if memory serves...

Re: 0w30 instead of 5w30 rod knock gone [Re: AndyinAL] #3982521
01/18/16 11:28 AM
01/18/16 11:28 AM
Joined: Apr 2008
Posts: 39,216
Ontario, Canada
OVERKILL Online content
OVERKILL  Online Content

Joined: Apr 2008
Posts: 39,216
Ontario, Canada
Originally Posted By: AndyinAL
Just to satisfy my own curiosity, I hope there is a board member on here that can tell us what exactly this noise is. A had a 1995 Civic with a d16 that made an awful noise when cold but was dead silent after it was up to temp. I adjusted the valves and ruled them out. I knew it wasnt valves anyway because this noise was only UNDER LOAD. I just always let it warm up several minutes and never had any issues. I sold it to a buddy for cheap and he drove it for years with never an issue but the noise was always there. Dead silent at normal operating temp. I know it has to be piston slap or rod bearings on the high end of tolerance but never knew for sure. It sure wasn't worth tearing into just for curiosity. This was a 1995 d16 SOHC. D16Z6 if memory serves...


It is piston slap and is due to short skirts and excessive piston to bore clearance that gets taken up when things expand as they get heat into them.

Rod knock happens when the oil thins, ergo, you won't get rod knock on startup as that's when the oil is the thickest. An engine with excessive rod to journal clearances is usually quiet on start-up and gets progressively louder as it warms and the oil thins.

In comparison piston slap is most pronounced when an engine is stone cold and will get progressively quieter, usually going away completely as the engine gets up to temperature.


They can sound very similar but how they manifest is completely opposite.


2019 RAM 1500 Sport - Mobil 1 EP 0w-20, FRAM Ultra
2016 Grand Cherokee SRT - Ravenol SSL 0w-40, FRAM Ultra
Re: 0w30 instead of 5w30 rod knock gone [Re: Miller88] #3982559
01/18/16 12:05 PM
01/18/16 12:05 PM
Joined: Aug 2009
Posts: 2,276
PA
Gasbuggy Offline
Gasbuggy  Offline

Joined: Aug 2009
Posts: 2,276
PA
Originally Posted By: Miller88
Do they use hydraulic lifters?



Solid


Cadillac CTS-V 6.2L 10w30PP
Volvo P1800 5w30 Euro L
LR Series III 10w40 VWB
76' 300D Edge 0w40
02 Yukon 10w30 PP
10 Charger Pursuit 5.7L
95 Accord - 386k. Mobil 2 RIP
Re: 0w30 instead of 5w30 rod knock gone [Re: fuzzysig] #3982633
01/18/16 01:05 PM
01/18/16 01:05 PM
Joined: Jan 2016
Posts: 22
WA
fuzzysig Offline OP
fuzzysig  Offline OP

Joined: Jan 2016
Posts: 22
WA
I went through a single cam stage when I was looking for a car

3 of them had a rod knock d16y8 is notorious for it.
almost all of them go out that way and more than half are developing one as we speak...
first one I bought a used core the guy said ran fine turns out had a spun bearing
I had to get the car out of the garage like yesterday so I went to pick and pull and got a used bearing from 91 civic of same color. sandpaper the rod journal and slap that sht in.

motor seized halfway down the street I put it in gear and rocked that btch loose. it started again lol.( I was pretty surprised)
but had a massive rod knock...
drained the 5w30 next day and put 0w30 mobil one.
started up and after few days the rod knock only show up for less than a second during startup.
drove that car for 8 months
then I decided to test this and switched back to 5w30. rod knock came back right away and I sold it...

my wife blew up a motor in her work civic
I swapped a d16y7 from junk yard. had a rod knock put 0w30 rod knock gone. drove it for another year and a half daily
same with my buddys car. I tld him to try and he did. drove the car for another year before it blew up

had a built gsr motor for 2 years, made a mistake of using felpro cam seals and supertech valve seals after fixing headgasket leak. they both leaked like mofo and oil pump went out after 200 miles due to oil loss. I put new oil in it and drove it for 2 days with bad oil pump not knowing that the engine was a dead man walking since it didn't make any weird noises and ran fine. (the only 2 days that I didn't have my oil pressure gauge hooked up after rebuild.. it fn got me good...

on the second day it started getting a lot louder so I took the vc off and pretty much found a dead motor full of metal shavings and it was still running with the 0w30 in it.

but those are extreme cases lol
usually I can hear and feel the motor running and cold start smoother when switching from 5w30 to 0w30

Re: 0w30 instead of 5w30 rod knock gone [Re: fuzzysig] #3982636
01/18/16 01:05 PM
01/18/16 01:05 PM
Joined: Jan 2016
Posts: 22
WA
fuzzysig Offline OP
fuzzysig  Offline OP

Joined: Jan 2016
Posts: 22
WA
its definitely rod knock I can hear it with a stethoscope
it didn't go away after warm up on 5w30 it just wasn't as loud as during cranking before oil pressure builds up
changing oil wouldn't affect piston slap

Last edited by fuzzysig; 01/18/16 01:06 PM.
Re: 0w30 instead of 5w30 rod knock gone [Re: fuzzysig] #3982923
01/18/16 06:56 PM
01/18/16 06:56 PM
Joined: Nov 2015
Posts: 1,462
KingCake Offline
KingCake  Offline

Joined: Nov 2015
Posts: 1,462
Originally Posted By: fuzzysig
I went through a single cam stage when I was looking for a car

3 of them had a rod knock d16y8 is notorious for it.
almost all of them go out that way and more than half are developing one as we speak...
first one I bought a used core the guy said ran fine turns out had a spun bearing
I had to get the car out of the garage like yesterday so I went to pick and pull and got a used bearing from 91 civic of same color. sandpaper the rod journal and slap that sht in.

motor seized halfway down the street I put it in gear and rocked that btch loose. it started again lol.( I was pretty surprised)
but had a massive rod knock...
drained the 5w30 next day and put 0w30 mobil one.
started up and after few days the rod knock only show up for less than a second during startup.
drove that car for 8 months
then I decided to test this and switched back to 5w30. rod knock came back right away and I sold it...

my wife blew up a motor in her work civic
I swapped a d16y7 from junk yard. had a rod knock put 0w30 rod knock gone. drove it for another year and a half daily
same with my buddys car. I tld him to try and he did. drove the car for another year before it blew up

had a built gsr motor for 2 years, made a mistake of using felpro cam seals and supertech valve seals after fixing headgasket leak. they both leaked like mofo and oil pump went out after 200 miles due to oil loss. I put new oil in it and drove it for 2 days with bad oil pump not knowing that the engine was a dead man walking since it didn't make any weird noises and ran fine. (the only 2 days that I didn't have my oil pressure gauge hooked up after rebuild.. it fn got me good...

on the second day it started getting a lot louder so I took the vc off and pretty much found a dead motor full of metal shavings and it was still running with the 0w30 in it.

but those are extreme cases lol
usually I can hear and feel the motor running and cold start smoother when switching from 5w30 to 0w30


lolwut I've worked on so many abused d16y7/8s they don't all get rod knock that's ridiculous.

Willing to bet someone didn't properly torque the crank pulley bolt after a timing belt job...

Re: 0w30 instead of 5w30 rod knock gone [Re: fuzzysig] #3983141
01/18/16 09:57 PM
01/18/16 09:57 PM
Joined: Jan 2016
Posts: 22
WA
fuzzysig Offline OP
fuzzysig  Offline OP

Joined: Jan 2016
Posts: 22
WA
I just got lucky that's why I gave up on single cams. after that

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