From the service manual ;
Oil sump fixing screw M6 10nm/ 7.37 ft. lbs.
I never use a torque wrench on these small fasteners, I use a long tee handle Allen and tighten until it just flexes slightly,
sealant on gasket? Not necessary , I do wipe mine with a light bit of grease
Lock tight not required , I would just re check after a couple of heat cycles