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Hi This is my second Duramax and I have and do run them on synthetic Amsoil. I change all the fluids in the fall just b4 we set out on our winter adventure. My plan is to run 15000 btwn oil changes. I never make it as I seem to get nervous around 10000 and change it somewhere btwn that and 15000. I always order 4 oil filters at the time and change them every 5000 no mater what. Seems to work fine for me and I expect at least 200,000 or more. I don't wait for the 50000 mile trans change as I work mine harder than the average user. It gets changed every fall and the smell tells you it definately needs it. Dan
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Hybrid Mode
