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It all depends on how well it has been taken care of. I have seen them with more than 500,000 miles on them. Mine has 220,000 and is still running great.
I'll give the 6.6L LML Duramax V8 a life span of 9 to 11 years with 200,000 to 275,000 miles.

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10y ago

What else can I help you with?