Plenum Gasket
 

95' ES 300

Im needing to replace the rear valve cover gasket as it is leaking. I know i have to remove the intake plenum. My question is can i reuse that gasket? or is it a one time use type gasket?

You can re-use any gasket if you want to. But should you? No. There are a few exceptions, drain plug gaskets, thermostat, a few others.

But in this case, use a new gasket.

The plenum gasket at the dealership costs $10. There's no reason to reuse the old one.