Spark Plug Tube O-ring Install?
 

Is the expensive Porsche grease really necessary for this job?
I have plenty of Silicone grease around the house, but my first inclination would be to use motor oil to lubricate the O-rings to facilitate installation.
Am I overlooking something?

TIA

The Porsche grease is not exclusively required....... engine oil works as does high temp silicon grease.
Check out pedrosgarage.com-Site-Technolab.html for more details.

I used a little bot of di-electric grease, you can use oil or vaseline as someone else recommended. No issues and my leaks have stoped. Put on both o rings.

The OEM stuff is a silicone grease, we use dielectric grease which works fine.

lithium grease works too

clean engine oil

+1 Clean engine oil.