have the distributor o-ring (~100 pesos lang ito) and oil seals checked for leaks. sorry wala pa akong experience sa overhaul since di ko pa naman kinailangan. religious ang palit ng oils at fluids. i'll just share with you regular maintenance items that i use/used.
regular oil change: shell helix ultra, vic oil filter (nothing beats a well-oiled machine

)
petron gas saver (hinahalo sa gas, ~php50-php80 depende sa station) once a month or once every two months
genuine air filter, condenser, contact point, and denso spark plugs from toyota auto supply (e.g. cruiser at sucat road) or from casa
toyota transmission oil and coolant from casa
tires are 185/70-13 (bridgestone ar10)