Oil in my radiator but no water in my oil

Hello, double checking the workshop manual, I cannot find any oil passages that correspond with the radiator -- for example, being a manual transmission, there is no transmission oil cooler with a manual transmission equipped vehicle. There is no engine oil cooler. Therefore, I would imagine that someone could have inadvertently put some oil into the radiator. It would be extraordinarily unlikely for engine oil and coolant to intermix inside the engine, so I'm not really thinking that's an issue. I'd drain and fill your cooling system and refill with proper coolant, and re-evaluate in time. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops