733i red oil warning light

red oil pressure warning light lingers on at atartup then goes out , then again turns on when car reaches operating temp, but sometimes goes out when i accelerate. the oil level is fine, and i recently changed oil and filter. started having problem immediately after replacing fan belt.

have you checked the oil pressure sending unit, its located on the cylinder head near the firewall.

mark

i guess engine is going down( I hope not ), but if it is you still can keep car running by putting thick oil: 20W-50, espially if you live in hot area.