Well my mother's 98 Monte Carlo Z34 3.8L overheated a few days back to 260 degrees due to a broken tensioner pulley that snapped the belt which then stopped the water pump. When she noticed the coolant temp gauge in the red she pulled over and shut it down and a tow truck pulled it the rest of the way. It was running Schaeffer 10W-30 PAO blend with a Supertech oversized PF52 oil filter. Both had around 2000 miles of running time on them. Should I change the current oil with fresh oil or would the current oil still be fine. With the coolant temp at 260 degrees the oil would be well over 200. Other than a higher insolubles level and probably shorter oil life would it be okay to continue to run the Schaeffer's or fill with new? Opinions?