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Volvo does recommend straight 30. And 10 psi o oil pressure is not low enough to trip the oil pressure switch, it needsto be down lower than 4 psi.
What being said, 2 questions back to you.
1. What is the full model number on the engine. GSi is a family of engines. I would need the whole thing. There should be another letter or two after the GSi
2. When was the last time the cooling system was serviced with a new impeller and thermostat?
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