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using oil ?
 

have you ever heard of a duramax using a little oil becasue of idiling too long? i have 3800 miles on my last oil change, and i pulled my dipstick on the truck and it was about a quarter up the operating range... i talked to a few guys at work and they said it was because i was letting it idle all the time?? i no darn well its not leaking anywhere, i park in a concrete barn everynight?????