O ring lubricant
- Thread starter Jay3702
- Start date
I would guess coolant.
When doing the water pump with a timing belt change on the Honda, they just call for coolant.
Sil-glyde should be fine also.
I'd use coolant or grease. Even a few drops of motor oil. Dry o-rings lead to leaks.
Just my $0.02
Heck no! Oil deteriorates rubber.
dielectric/synthetic grease or RectorSeal Tplus2.
BMW says to go in dry
I use silicone grease for that, unless it's a silicon o-ring
Because oil degrades o-rings. either shrinks or swells them.
Silicone grease for nitrile O-rings.
BrendanC
$100 site donor 2024
CRC Food grade silicone spray is what i use to lube any rubber on a vehicle. helps get hoses on, intake boots, O-rings etc.
That's quite a generalization.
I'm not the only one,
But go ahead and use oil and post back in 6 months asking why is my new water pump leaking.
I guess you have never seen o-rings used to seal piping containing oil then?
There are many oil containing items in a vehicle that use o-rings to seal them.
The standard black orings from harbor freight, work fine with oil.
I have and you can spec a material that is more resistant. But why on a water pump?
OP is talking about a water pump used to move coolant, not oil.
Except for the goofy BMW stuff, I'm sure the o rings supplied for some aftermarket coolant pump are not going to have some latex orings. Latex 
The talk was about using oil on them to slip parts together???
The talk was about using oil on them to slip parts together???
