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definitely oil on your exhaust plumbing or heat sheild somewhere. I imagine at those speeds it probably got evrywhere, maybe on the downpipe and so on. It takes a long time for that to burn off. I get my car oilsprayed every spring and fall and that stuff takes weeks to burn off.
I change my own oil and I spilled it on the heat sheild once, it took hours to "burn" off on its own. I did it again and ran the car with the hood open and gently hosed off the manifold- the steam effect loosens the oil i think
Mine is a very well maintained 93 and I do 100 mph fairly often without incident from the engine so I wouldnt think you hurt anything in that sense.
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