I had an oil change done and the oil was found to be very flaky. Anyone else have this experience? I have a 17 FXT that had the original engine replaced at 19,000 miles with a new one from Subaru because the original one blew up (something malfunctioned and punched a hole through the engine while I was on the highway..) I'm kind of worried it might happen again as the engine shudders sometimes too and knocks on occasion when accelerating.