xj40 1994 4.0 sport

129000 miles what oil would you recomend

when car is hot im droppin oil pressure oil is very thin fron cold so im
assuming its even thinner when hot

and sometimes while driving (sport mode selectes) floor accelorater

she kicks down     from rear mirror shes smokes like a bitch  very
embarasing  worse that cheech and chongs up in smoke :)

i have overfilled the oil  for (oilpresure dropin ) dont know why  i have

about two years ago i had to replace head gasket (small area of corrosion on
head ) cant belive how much mess it makes when head gasket gives
up....anyway did all that
new head bolts bla bla bla .....what im gettin at is changed stem seals so
they should still be good

is it my overfilling with oil thats some how getting reburnt though inlet
manifold side (breather hose thingys)

no smoke on tick over or when slightly blip throttle (doesnt smoke everytime
floor it also )

basicly what grade of oil would help my case

thanks