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Uhmm if it was atf, it's nothing but 10wt oil with a detergent package in it. If it can lubricate all of the shafts, gears, and bearings and band brakes, clutches, etc in an automatic transmission for 60k miles with no issues. (How long a lot of people go between flushes) I highly doubt it did any real damage to an engine in an hour.
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