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Guesses? Severe piston slap = high wear metals? #4669257
02/18/18 03:57 AM
02/18/18 03:57 AM
Joined: Aug 2009
Posts: 1,991
PA
Gasbuggy Offline OP
Gasbuggy  Offline OP
Joined: Aug 2009
Posts: 1,991
PA
My 2002 Yukon XL has thee worst cold piston slap of any 5.3 I've ever heard. And I've owned and drove many. Random citizens with likely no car knowledge whatsoever turn and stare when I fire it up and drive off. I'm sure the neighbors are confused because my driveway looks like James Bond lives here but half the time I'm rolling out in something that sounds like it's about to blow up. It has the charm of a rod knock but it is merely piston slap. Piston slap so bad it throws the knock sensors off for the first 30 seconds if it's below freezing. I bought it in the summer so I didn't get fully acquainted with the severity until this winter.

I changed the clean Jiffy Lube oil when I bought it and put in MaxLife 10w30. It hardly has burned a drop of oil in 5000 miles, burns rubber though. I'll probably change it at 7k. No complaints for a $1500 beater that was maintained and had newer tires, brakes, and cooling system.

Anyone want to throw a guess on if wear metals will be higher with this condition? I can't see how it wouldn't. I mean, something is smashing into something every time I cold start it. You can still lightly hear it when it's fully warmed up.


CTS-V+Recaros 5w30 Magnatec
Volvo P1800 5w30 Euro L
Land Rover Series 10w40 VWB
76' 300D Edge 0w40
02 Yukon 10w30 MaxLife
95 Accord - 386k. Mobil 2 RIP
Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy] #4669260
02/18/18 04:53 AM
02/18/18 04:53 AM
Joined: Dec 2002
Posts: 40,919
'Stralia
Shannow Online content
Shannow  Online Content
Joined: Dec 2002
Posts: 40,919
'Stralia
As an engineer, piston slap tells me that things aren't operating correctly.

Things that should be happening in a slappy engine are:
* Higher, irregular loading of points on the piston skirts (more wear)
* higher scyclic loading including impact on the skirts (high cycle fatigue)
* cocking of the piston rings (reduced seal and wear).

But the things seem to typically live lives that see out the chassis and running gear, so like the other compromises that OEMs make "not ideal" is not the same as "about to blow up.

Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy] #4669263
02/18/18 05:12 AM
02/18/18 05:12 AM
Joined: Sep 2010
Posts: 7,009
Texas
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 7,009
Texas
I thought guys like short skirts. The worst I had was a 2004 Yukon … about 10 seconds after start up and done= after we put 130k trouble free on the unit … saw it around town for a few years after. BiL put 400k on his and the motor never failed … it did it …Some have called the polymer coating a band aid … but they are not wearing out prematurely …
My 2010 has a tiny amount at start up … the 2017 is just a very quiet motor, period.

You could experiment with various oils and see what happens …

http://www.autos.ca/auto-tech/auto-tech-noisy-engine-it-might-be-piston-slap/

Last edited by 4WD; 02/18/18 05:16 AM.
Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy] #4669275
02/18/18 05:51 AM
02/18/18 05:51 AM
Joined: Jan 2018
Posts: 534
San Antonio, TX
das_peikko Offline
das_peikko  Offline
Joined: Jan 2018
Posts: 534
San Antonio, TX
10W-40 MaxLife would probably be better. It'd give you more film thickness on the cylinder wall. More film thickness might offer a better cushion between the piston and cylinder wall.

Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy] #4669316
02/18/18 08:09 AM
02/18/18 08:09 AM
Joined: Dec 2004
Posts: 9,332
1/2 hr N.E. of Detroit
Triple_Se7en Offline
Triple_Se7en  Offline
Joined: Dec 2004
Posts: 9,332
1/2 hr N.E. of Detroit
Originally Posted By: Gasbuggy
My 2002 Yukon XL has thee worst cold piston slap of any 5.3 I've ever heard. And I've owned and drove many. Random citizens with likely no car knowledge whatsoever turn and stare when I fire it up and drive off. I'm sure the neighbors are confused because my driveway looks like James Bond lives here but half the time I'm rolling out in something that sounds like it's about to blow up. It has the charm of a rod knock but it is merely piston slap. Piston slap so bad it throws the knock sensors off for the first 30 seconds if it's below freezing. I bought it in the summer so I didn't get fully acquainted with the severity until this winter.

I changed the clean Jiffy Lube oil when I bought it and put in MaxLife 10w30. It hardly has burned a drop of oil in 5000 miles, burns rubber though. I'll probably change it at 7k. No complaints for a $1500 beater that was maintained and had newer tires, brakes, and cooling system.

Anyone want to throw a guess on if wear metals will be higher with this condition? I can't see how it wouldn't. I mean, something is smashing into something every time I cold start it. You can still lightly hear it when it's fully warmed up.


I wouldn't do 7K OCIs using semi-synthetic on a 16 year-old vehicle. Many semi-synthetics only have around 25-30% synthetic oil in the jug.


She's the only sister-in-law I have. But she's not my favorite.
Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy] #4669350
02/18/18 08:57 AM
02/18/18 08:57 AM
Joined: Sep 2008
Posts: 3,894
Southeast Texas
gfh77665 Offline
gfh77665  Offline
Joined: Sep 2008
Posts: 3,894
Southeast Texas
Originally Posted By: Gasbuggy
No complaints for a $1500 beater that was maintained and had newer tires, brakes, and cooling system.


SAE 30wt. in winter, SAE 40wt. rest of the year.

Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy] #4669370
02/18/18 09:12 AM
02/18/18 09:12 AM
Joined: Apr 2013
Posts: 5,784
FL, USA
gregk24 Offline
gregk24  Offline
Joined: Apr 2013
Posts: 5,784
FL, USA
I don't think I have ever heard or read of piston slap killing an engine. I know my previous Accord slapped from the time I got it at 97K miles to when I traded around 140K. I know its not the same miles as yours but again, no issues with mine.


2012 Honda Accord EX-L K24z3
54,xxx miles
PPPP 0w20 / Fram Ultra

2014 VW Jetta SE 1.8T ea888
40,xxx miles
Castrol OEM dealer fill / OEM filter
Re: Guesses? Severe piston slap = high wear metals? [Re: gregk24] #4669378
02/18/18 09:18 AM
02/18/18 09:18 AM
Joined: Sep 2010
Posts: 7,009
Texas
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 7,009
Texas
Originally Posted By: gregk24
I don't think I have ever heard or read of piston slap killing an engine. I know my previous Accord slapped from the time I got it at 97K miles to when I traded around 140K. I know its not the same miles as yours but again, no issues with mine.


Internet is full of things

https://m.youtube.com/watch?v=fwe7qxu10sU

Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy] #4669415
02/18/18 09:40 AM
02/18/18 09:40 AM
Joined: Feb 2011
Posts: 1,266
Wishin' I was in Wi
mjk Offline
mjk  Offline
Joined: Feb 2011
Posts: 1,266
Wishin' I was in Wi
Since it really owes you nothing, and the 5.3 will outlast the body, throw in a quart of Lucas and see if that quiets it.



coffee coffee

Re: Guesses? Severe piston slap = high wear metals? [Re: mjk] #4669420
02/18/18 09:44 AM
02/18/18 09:44 AM
Joined: Sep 2010
Posts: 7,009
Texas
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 7,009
Texas
Originally Posted By: mjk
Since it really owes you nothing, and the 5.3 will outlast the body, throw in a quart of Lucas and see if that quiets it.



coffee coffee


No ~ Slick 50 dude

Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy] #4669428
02/18/18 09:48 AM
02/18/18 09:48 AM
Joined: Aug 2003
Posts: 2,266
Naperville, IL
wwillson Offline

Administrator
wwillson  Offline

Administrator
Joined: Aug 2003
Posts: 2,266
Naperville, IL
My 5.3L 2002 Suburban had loud piston slap for the first couple minutes after startup. I did several oil samples, which are posted here, and the wear metals were always low. The piston slap didn't seem to cause accelerated wear, just the annoying knocking.

Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy] #4669437
02/18/18 09:53 AM
02/18/18 09:53 AM
Joined: Oct 2008
Posts: 19,093
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,093
Sunny Florida
We have had many GM V8 "slappers" over the years. Never any issues other than some annoyance.

Our worst slapper was sold with over 500k miles on it, doesn't seem to hurt longevity at all...


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: Guesses? Severe piston slap = high wear metals? [Re: wwillson] #4669450
02/18/18 10:02 AM
02/18/18 10:02 AM
Joined: Sep 2010
Posts: 7,009
Texas
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 7,009
Texas
Originally Posted By: wwillson
My 5.3L 2002 Suburban had loud piston slap for the first couple minutes after startup. I did several oil samples, which are posted here, and the wear metals were always low. The piston slap didn't seem to cause accelerated wear, just the annoying knocking.


Didn’t you run like a 15w40 Delvac ? I’m finding on that or Delvac 1 5w40 there is really little difference at startup

Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy] #4669532
02/18/18 11:13 AM
02/18/18 11:13 AM
Joined: Dec 2016
Posts: 6,262
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,262
Waco, TX
20% oil capacity with Lucas Oil "stabilizer"

Yes, it's thick snake oil - but it will help quite a bit.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Guesses? Severe piston slap = high wear metals? [Re: SteveSRT8] #4669535
02/18/18 11:16 AM
02/18/18 11:16 AM
Joined: Mar 2015
Posts: 10,824
In the shop
53' Stude Offline
53' Stude  Offline
Joined: Mar 2015
Posts: 10,824
In the shop
Originally Posted By: SteveSRT8
We have had many GM V8 "slappers" over the years. Never any issues other than some annoyance.

Our worst slapper was sold with over 500k miles on it, doesn't seem to hurt longevity at all...



Yep, we sold our 2010 5.3 v-8 plow truck Chevy 2500 reg cab 4x4 with 279,xxx on it and it had this piston slap and nothing but Safety Kleen 5w30 DEXOS oil


09' Camry LE, 141,020 miles

PP 5w30 and TG 4967
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