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I have an 88 245 with 106K miles with Amsoil from engine to tranny to differential, no problems with the extended drain intervals, I changed the filter at 12,000 miles and will go for another before redrain and fill, the oil is dark, but not like the burned petro oil left in cars for over seven or eight thousand miles, it reduces labor and oil cost, the gear oil in the tranny and differential would be good for hundreds of thousands of miles, provided water stays out which unless you get flooded you should have a problem with.
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