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WD40 o rings ? #3203215
12/01/13 07:18 PM
12/01/13 07:18 PM
Joined: Apr 2008
Posts: 1,830
IL
Ndx Offline OP
Ndx  Offline OP
Joined: Apr 2008
Posts: 1,830
IL
Hey Guys,

Anytime I have to slide something with o ring I will lube it with WD40
A) it will not migrate like let say vaseline but it will evaporate

WD40 website says safe for rubber
I seen some diy test where orings were not affected after seating for 24hrs

Should I replace orings that I used WD40 on ?
Or not worry about it ?

Re: WD40 o rings ? [Re: Ndx] #3203222
12/01/13 07:26 PM
12/01/13 07:26 PM
Joined: Oct 2002
Posts: 36,420
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline
Joined: Oct 2002
Posts: 36,420
Great Lakes
If I remember our last discussion on this correctly, according to the manufacturer of WD40, it is safe on o-rings.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (FF)
Re: WD40 o rings ? [Re: Ndx] #3203226
12/01/13 07:27 PM
12/01/13 07:27 PM
Joined: Jan 2012
Posts: 1,748
ventura, ca
morepwr Offline
morepwr  Offline
Joined: Jan 2012
Posts: 1,748
ventura, ca
Your correct. The WD40 will evaporate off and wont hurt a thing. No worries.

Re: WD40 o rings ? [Re: Ndx] #3203237
12/01/13 07:50 PM
12/01/13 07:50 PM
Joined: Oct 2007
Posts: 403
Ga
DB_Cooper Offline
DB_Cooper  Offline
Joined: Oct 2007
Posts: 403
Ga
Originally Posted By: Ndx
Hey Guys,

Anytime I have to slide something with o ring I will lube it with WD40
A) it will not migrate like let say vaseline but it will evaporate

WD40 website says safe for rubber
I seen some diy test where orings were not affected after seating for 24hrs

Should I replace orings that I used WD40 on ?
Or not worry about it ?


Don't worry about it...anything is better than nothing and WD-40 is harmless. Personally, I use Vaseline. Vaseline melts at about 100*F and I have not noticed any mess. It disappears very quickly around a hot engine. Never had a seal/lip or "O" ring leak with Vaseline..(knock on wood)

Re: WD40 o rings ? [Re: Ndx] #3203331
12/01/13 09:46 PM
12/01/13 09:46 PM
Joined: Jun 2003
Posts: 33,266
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,266
ME
I've used motor oil on gas line fittings and the appropriate fluid (PS, ATF, etc) on everything else.

Probably too little to make any difference.

Re: WD40 o rings ? [Re: Ndx] #3203336
12/01/13 09:49 PM
12/01/13 09:49 PM
Joined: Mar 2004
Posts: 20,828
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,828
Upstate NY
O-rings are normally made of neoprene rather than rubber. Personally I would use a silicone based grease like Sil-glyde.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: WD40 o rings ? [Re: Ndx] #3203347
12/01/13 09:57 PM
12/01/13 09:57 PM
Joined: Apr 2008
Posts: 1,830
IL
Ndx Offline OP
Ndx  Offline OP
Joined: Apr 2008
Posts: 1,830
IL
Thx, should I replace them then ?

According to WD40,neoprene is not affected by it...

For all variations : WD-40 demonstrates none to negligible deleterious effect to plastic, rubber, and metal hard surfaces. This includes Acetal, neoprene/hard rubber, HDPE, PPS Copolymer Polysulfone, Teflon, Viton, steel, galvanized steel hot dip, electroplated, copper, brass, magnesium, nickel, tin plate, titanium, and zinc

According to msd there are some rubbers that will swell after prolonged exposure... Orings are pretty tight sealing stuff so I wonder if it will evaporate or because its tight its just gonna sit there ?

Last edited by Ndx; 12/01/13 10:06 PM.
Re: WD40 o rings ? [Re: Ndx] #3220447
12/18/13 10:30 AM
12/18/13 10:30 AM
Joined: Apr 2012
Posts: 2,630
West Michigan
buck91 Offline
buck91  Offline
Joined: Apr 2012
Posts: 2,630
West Michigan
Is wd40 still Stoddard solvent, mineral oil and an evaporative carrier?


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop

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