Read the manual that comes with the part.
The service manual cannot give you guidance on this.
There are some rear main seals that are not
meant to be lubricated (the PTFE ones for example), lubricating those will result in early failure, you do not want to repeat this job.
Also here's a PDF from VR that has a bunch of steps for their PTFE seals (that are usually the same steps for all PTFE). Note that you don't lubricate and you remove them from their tube/holder only before installation.https://www.victorreinz.com/functio...ebe7443f55a7e3a00e1002a4a10797e0cc4d0099
Damaged PTFE Sealing Lip
The most frequent cause for failure is damage to the PTFE sealing lip during assembly. If the seal is installed without the help of a sleeve or special tool, and is shifted or even turned inside out, reliable sealing will hardly be possible.
Similarly, the use of oil or grease – as with classical oil sealing rings – will result in total failure of the PTFE oil seal immediately after installation.