temperature goes high to 210F there is oil in coolant system. Relaced head gasket and flushed system. oil still in Coolant
what else can it cause the oil to show up in coolant system?
Unfortunately, these are classic symptoms of a blown head gasket. I would get it into the shop asap before you crack the actual head by overheating the engine. Best of luck!
You may have a cracked head or it could be warped in which case a new head gasket won't help. Heads need to be checked for flatness and for leaks. The leak test is not standard in my experience so a crack could have been missed. Did the engine overheat badly before the head gasket went out the first time?
Check the water pump there is an oil seal that may leak