Lubricant that will help shower valve o-rings last longer???

[Tazbom]

I am replacing a Delta shower faucet valve. Is there a lubricant that will help the o-rings last longer? I heard Vaseline is not good, but that WD 40 is. What do those who are knowledgeable say? Any help is much appreciated! Thank you!

 

[Reach4]

Silicone plumber's grease is not bad for the rubber and it lubricates well. It is food safe. I have a tube of Molykote 111. It is very thick. A little goes a very long way. To avoid getting grease on other things, I wear nitrile gloves to apply it by hand, or I use a Q-tip.

I would not use WD-40 for lubing rubber washers and O-rings myself.

https://www.dowcorning.com/content/publishedlit/80-3256.pdf page 29 says Molykote 111 is "suitable for use with potable water under NSF 61."

 

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[Tazbom]

Thank you!!