GT86 Oil Pressure Warning Light

Hard to say without a proper look. But the oil pressure light being on could mean there's something up with the oil itself. When did you last change it?

About 15000 km ago. I know that's pushing it. Could going so far over cause the oil to get gunked up and trigger these warnings? What should I do next?

Yeah, going that far over could definitely cause the oil to degrade and get contaminated, which could trigger the oil pressure warning. I wouldn't drive it anymore. Get it to a shop, change the oil and filter, and have them check the oil pressure properly.

Thanks for the advice. Took it to a shop, and you were right, it was the overdue service. The oil was super contaminated, causing low pressure. An oil and filter change fixed it, cost 165€ . Appreciate the help!