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ok i changed the oil in my 4 litre cherokee,to a high mileage 5 w 20 oil,not a good idea.within 100 km it started banging hard eventually shutting down till i coasted stop on the highway.Its an old 99 with 175,00 mile ,not km.I can get a 4 litre from a tj with 45,000 km on it.I was wondering if...