my ed with a d16y1 is blowing smoke on vtec and my oil doesnt seem milky so hopefully its not the head gasket. (plus my coolant doesnt seem to go down)

is it really not worth the time to replace valve seals if they are gone? everyone tells me to not bother with a d series but i would like this car to last a while longer.

im currently using any cheap 20w-50 oil i can get