How long does it take for a cleaning additive to work? Should I use synth oil? on 2006 Kia Sorento

Oil presuure light went on. Shop did a pressure test. Oil pressure on low half of block ok. Passage ways for oil to top of enging clogged. Oil additine was added. Was recommended to chage oil in 2 months. Should i change the oil now or wait to see if this additive will take. Pressure light still comes on but at longer driving intervals than before.

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