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I don't have a problem with GM saying stick to the Driover's Information System (DIS) and change the oil when the system says so. It would probably save a bit of money - HOWEVER - if there is going to be any problems caused to the engine and parts by not changing the oil as frequently as every 3000 towing or 5000 regular driving, these problems will not show up until well after the warranty has run out out. The Duramax is a great engine - should last 250,000 to 300,000 if looked after. For my money I will stick to the 3000 and 5000 mile changes - If the Duramax really does not need new oil at that time it still can't do any harm at all to put in fresh oil. I intend to keep mine for a long time. For my peace of mind I will continue to keep to my own oil change schedule. I don't profess to be an expert on this but at least I feel good even though I may be wasting a few $'s per year.
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