Originally Posted by surlynkid
Twice the thickness is no problem. Using double stacked o-rings to do it is the problem. My background is BSChE with 23+ years in chemical plants. It will fail. You need a custom sized one that can withstand the heat and the oil. A nice custom made Kalrez one would be the ticket.
I know I used the term o-ring which by definition would cause an issue if you tried using two actual o-rings stacked. Of course the oil cap uses a gasket and not technically an o-ring as I stated. That being said, stacking two gaskets should be no issue.