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#2422832 - 11/01/11 10:30 PM Cold piston slap, thicker oil?
CBR.worm Offline


Registered: 05/10/05
Posts: 1687
Loc: Jupiter, Fl
My FX has always had cold piston slap, not bad. it goes away as it warms up, but sounds like a diesel when ambient temps drop below 60ish. I typically run M1 0w40. Should I go to something thicker when cold? Living in Florida I don't exactly need cold weather protection.
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#2422837 - 11/01/11 10:38 PM Re: Cold piston slap, thicker oil? [Re: CBR.worm]
Dakota1820 Offline
formerly chevyboy14


Registered: 04/28/11
Posts: 3894
Loc: missouri usa
It probably won't make a big difference but is try it. Try 10w30 or 10w40
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#2422849 - 11/01/11 10:48 PM Re: Cold piston slap, thicker oil? [Re: CBR.worm]
ammolab Offline


Registered: 01/16/06
Posts: 641
Loc: Ruidoso, NM USA
Your oil is THICKEST when cold... It the slap goes away when things warm up(oil now thinner)...how would a thicker oil help that piston slap?
Or is it the temp of the piston/parts that matters?


Edited by ammolab (11/01/11 10:49 PM)
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#2422859 - 11/01/11 11:00 PM Re: Cold piston slap, thicker oil? [Re: CBR.worm]
MrRPM Offline


Registered: 08/25/11
Posts: 437
Loc: Michigan
its probably the temp of the pistons that cause that. as they get hot they expand to the proper size/shape, as they are desighned to do.

so i could maybe see how using a thicker oil at start up could help cushion the piston slap, but who knows if it actually would work.

try it!
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#2422905 - 11/02/11 01:39 AM Re: Cold piston slap, thicker oil? [Re: CBR.worm]
chubbs1 Offline


Registered: 06/09/10
Posts: 4574
Loc: Merritt Island FL, USA
Can you use a 0w30? M1? That is what I would try, I am another who doesn't understand how a thicker oil would stop COLD piston slap. If you decide to go thicker and it helps please let me know, I would be surprised. M1 0w30 or the thicker Syntec 0w30 should do the trick. The Former being my choice, especially since we are getting towards our cold months. I had a neighbor with cold slap and I told him to go thinner and it was gone that day. Never had that issue again.
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#2422912 - 11/02/11 02:15 AM Re: Cold piston slap, thicker oil? [Re: CBR.worm]
aquariuscsm Offline


Registered: 12/30/06
Posts: 12972
Loc: South Texas,USA
Try either a 10W40 dino or if you want synth,M1 10W40HM. I bet either of these will do the trick. I`d try the dino first. Let us know how it turns out.
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#2422919 - 11/02/11 02:35 AM Re: Cold piston slap, thicker oil? [Re: CBR.worm]
Merkava_4 Offline


Registered: 01/30/07
Posts: 13187
Loc: Clovis, CA
Try some MaxLife 10W-40.

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#2422951 - 11/02/11 06:18 AM Re: Cold piston slap, thicker oil? [Re: CBR.worm]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 17160
Loc: Sunny Florida
As the owner of many 'slappers' I can tell you this. Get used to it. No oil is likely to help, as it's not clearances where oil is pressurized.

If it is real piston slap it will disappear very quickly, unlike a valve gear noise which can hang around a bit. On our engines it has absolutely no effect at all on the life or performance of the engine.
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#2422963 - 11/02/11 06:50 AM Re: Cold piston slap, thicker oil? [Re: SteveSRT8]
TFB1 Offline


Registered: 09/03/10
Posts: 3447
Loc: VA
Originally Posted By: SteveSRT8
As the owner of many 'slappers' I can tell you this. Get used to it. No oil is likely to help, as it's not clearances where oil is pressurized.


There you go, in a nutshell...

I could maybe see thicker oil helping if the slap was slight but usually the only thing that stops it is piston expansion as it heats up... Piston slap is basically the piston rocking slightly in the cylinder and while it likely won't cause a issue, I'd give the engine a minute or so to get heat into the pistons before I'd drive it...

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#2423033 - 11/02/11 08:51 AM Re: Cold piston slap, thicker oil? [Re: SteveSRT8]
Boss302fan Offline


Registered: 11/07/09
Posts: 2182
Loc: Oconomowoc Wi
Originally Posted By: SteveSRT8
As the owner of many 'slappers' I can tell you this. Get used to it. No oil is likely to help, as it's not clearances where oil is pressurized.

If it is real piston slap it will disappear very quickly, unlike a valve gear noise which can hang around a bit. On our engines it has absolutely no effect at all on the life or performance of the engine.


Ditto.
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#2423116 - 11/02/11 11:08 AM Re: Cold piston slap, thicker oil? [Re: CBR.worm]
KCJeep Offline


Registered: 06/30/11
Posts: 6044
Loc: Mahzurrah!
We have two "slappers", a 2000 Chevy 3.1 and a 2004 Chevy 3.4, both slap loudly when cold, both quite down quickly, and fooling with different oils has never made a bit of difference that I can detect.
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#2423151 - 11/02/11 12:02 PM Re: Cold piston slap, thicker oil? [Re: CBR.worm]
Bambam Offline


Registered: 12/16/03
Posts: 753
Loc: CT
How about using a block heater all the time, warmer engine less slap?
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#2423159 - 11/02/11 12:10 PM Re: Cold piston slap, thicker oil? [Re: CBR.worm]
aquariuscsm Offline


Registered: 12/30/06
Posts: 12972
Loc: South Texas,USA
My 2nd 3000GT I owned "slapped" with thinner synths. Dino made it go away completely. Some engines just seem finicky for some reason.
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#2423187 - 11/02/11 12:39 PM Re: Cold piston slap, thicker oil? [Re: CBR.worm]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 17160
Loc: Sunny Florida
You very likely proved it was not piston slap at all.
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#2423207 - 11/02/11 01:11 PM Re: Cold piston slap, thicker oil? [Re: CBR.worm]
Ken2 Offline


Registered: 12/02/02
Posts: 6358
Loc: Washington St.
My Tundra has had a cold piston tick for the last 115,000 miles with no changes, and I'm not worried about it. Some oils damp sound better than others, but there is really no reason to be concerned about the noise that goes away when warm. The aluminum pistons expand and contract more with heat changes than the cast iron block, so they're made to be loose when cold. No problem.
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