if it only comes with an o ring then use an o ring mate on the trucks i have done they never needed much more then that
I normally use a bit of gasket cement, just a smear of blue or grey Maxx. Probably not required but it gives me a warm fuzzy feeling
Don't use anything but the o-ring. Anything else and you run the risk of it breaking loose and being sucked into the pump etc and causing a blockage .....result ... KABOOM ...new engine please
Many years took some "advice" to use some non-setting gasket goo on the oil gallery o-rings between the head and barrels on my Ducati bike. I NEVER made that mistake again. Had to pull the engine to do the o-rings again after just a couple of months........... L8r E