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Sounds like a lot of blow-by. Could be piston rings in one or more cylinders. With any of that going on your pretty much asking for an overhaul. Anything can make that happen, best bet is to tear it down and make sure it's only piston rings not a bad cylinder wall etc.

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12y ago
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Q: 1994 dodge ram 2500 Cummins 12 valve blows oil out the dipstick uses 3-5 quarts every time using 15w-40 oil synthetic blend has 91k miles on it Whats wrong and how do you fix it?
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