2001 Daewoo Leganza problems!

Thick white smoke from tail pipe (no water coming out of tail pipe though), sputters when in idle or in gear, but does not cut completely off. Way too much oil was in it (over half way up the stick) and area where spark plugs are located was filled with oil. Gasket underneath spark plugs looks okay. Car does not and has not ran hot. Oil light stays off for a bit when you crank it, then flickers, and then permanently stays on.

Are you sure you have the right oil weight in there? if it's too thin, it won't make enough pressure.
SAMSUNG-SGH-A867/A867UCHJ3 SHP/VPP/R5 NetFront/3.5 SMM-MMS/1.2.0 profile/MIDP-2.0 configuration/CLDC-1.1

Change head gasket. Coolant is penetrating into the head.

You have too much oil in your engine or you haven't matched your oil density with the mileage/km specifications! How many miles does it have? Up to 100 000 km it is recommended 5w30 full synt oil and after 100 000 km it is recommended semi-synt oil like 10W40; 10w50 etc.