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Duramax
Also look at duramaxhub.com - there is a list of common problems but they are mostly for LB7 engine. Nothing listed for LMM version except DPF issues, and I read a long thread discussing transmission fluid lines to the cooler having leak problems.
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MikenDebbie Aggie ‘77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
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