salam
well bro agar if ur engine is weak ..and eats or blow engine oil .. so i think u should change ur engine ...
coz over hauling mai jitna ap ka kharcha hu ga autnay mai ap ku full engine assembly mil jaeya gee ...
and over hauling totaly depen on luck ... ya tu fit engine ban jaeya ga ... ya F*** up hu jaeya ga ... coz its efi enigne ...
crab engines over-haull achay hutay hai
and about stp ...
so its a oil used for weak engines ... 3 liters of engine oil plus one liter of stp...
but yaar engine per kui khass farak nai parta .... is say bhi ...
better option is change ur engine ... put some 2004 or above santro engine in it and feel the difference... thanks
t.care