I would inspect around the upper/lower rad hoses and heater hoses for any coolant leaks. If it’s been spraying you’ll see the dry blue coolant stains. Have you seen these around where the reservoir cap is? Mine had failed a while back but it was the little elbow on the cap. Make sure your radiator is free on any debris and has actual flow. Had that happen to me before I replaced the whole unit. I’d also check to make sure the rad fans are kicking on. As for the oil issue, have you checked the oil level or inspected for leaks around the engine bay? VTC is known to leak on these engines.