After reading various opinions on coolants etc. I need to know the thoughts on a specific situation. I removed my filler cap and failed to completely lock it down this weekend.(winner) All was well until I hit the four wheel road and it worked its way loose. Spilled about a gallon of coolant everywhere. No overheating or otherwise. I was relatively close to a town and purchased the universal coolant as that was the only option they had other than the usual stuff. So, I have a gallon of universal in my block. Had to drive about 165 miles home. IS it ok leave it until the next service interval, or go ahead and get the flush done and get the stuff out?