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How much weight do you tow, and how often? My 1-ton K5 on the car hauler weighs close to 9k and I use a 6.0L 2500HD. There are times when more power would be nice but it gets the job done and I've always been able to at least maintain the speed limit on the freeway if you really want to (i.e. let it downshift). Granted, haven't been in any big mountains but been down to Slade many times and out I-70 in Eastern Ohio many times (not unusual to have 18-wheelers doing 40 mph in spots).
132k so far with the majority of the miles daily driving on the freeway. The engine did lose the oil pump and was run for a short period with no oil pressure 30k ago but no apparent issues so far. The only other thing ever replaced was the water pump at the same time the oil pump was replaced. Guess I did change the plugs at 100k per the service manual.
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