@sleeplessmeyes,  i did mine at kuching...

@usus, for white smoke, u just change the oil seal should do..... around Rm400 and less...

Overheat and straight away want to do top overhaul?
Hold on that decision for a second.
Seems like you are a headless-chicken, not knowing what to exactly do.

Have your mechanic checked whether your cooling system is not blocked,leaking until no water, faulty radiator fan or even faulty water thermostat?
It maybe dirty, clogged and needs "flushing". Either goto a Radiator specialist, or buy a Radiator flush chemical and DIY yourself at home.

Try that and see if your engine still overheats.

Oil Leak? Find a bottle of leak preventers, example: GOLD EAGLE NO LEAK ENGINE OIL TREATMENT.
Otherwise ask your mechanic where is it exactly leaking.

Few months ago I bought a bottle of HOLTS RADWeld to stop my radiator leak, poured almost 1/2 the bottle and it stopped leaking. Saved me RM 100 repairs.

Dont look down at "off-the-shelf" chemicals in ACE Hardware or JUSCO; reputable/well-known brands can help you first in saving RM 100 over bucks of repair by following the instructions on the bottle.

If really la car overheated, engine stopped and someone tries to start again, then no need to think for top overhauls, cause the user already damaged the seized pistons.

My sis's ex-Kancil experienced full overheating once so badly,due to burst plastic T-pipe near the carb, the engine just stopped by itself at our porch gate. After cool down for 1 hr, start the engine again and it was running fine, except the valve sounded abit louder.

I too experienced engine overheating on my Nissan Sunny due to jammed water thermostat at "closed" position.When the engine overheats, engine feels much more laggy but still able to crawl safely.
After thermostat repaired, the water pump gave way 
But my engine runs fine after that until today.... 

So at least I have experiences in overheating situation.

oh ok thanks... then maybe both kena change edi