Hi all...I was replacing the in tank fuel pump on my 88 245 and looking at the Bentley manual instructions and it calls for petroleum jelly on the sealing o ring. Doesn't petroleum eat up rubber? or does it depend on the rubber. Also been talking to auto shop guy and is Vaseline considered petroleum jelly?

 

I'm looking at a jar of Vaseline and it says 100% pure petroleum jelly...um so guess I'll use Vaseline in there...

 

But why would it have an expiration date...