Should I lubricate new brake booster check valve grommet?

[Silver]

To get it to slide in or seal better?

Or is there a risk of incompatibility between lube and grommet material?

 

[GoldDot40]

Use either silicone or lithium grease or...just Vaseline.

 

[Kamele0N]

Silicone grease would be the most "inert" towards the rubber/grommet...

 

[60jeffrey]

Vaseline deteriorates rubber, as it's a petroleum based product.

 

[AutoMechanic]

Use silicone or dielectric grease and lubricate them.

 

[GoldDot40]

Vaseline deteriorates rubber, as it's a petroleum based product.

It does deteriorate 100% rubber, but most automotive grade grommets are made with polymers and highly resistant to petroleum.

 

[atikovi]

I have an 8 oz bottle of this stuff https://www.ipcol.com/assembly-lubricants/p80-emulsion for 20 years and it's still half full. Use it on radiator and heater hoses most often.

 

[Silver]

Thank y'all.