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First time Cadillac Owner first time poster. I just purchased a one owner 05 Cadillac Deville DHS that looked fantastic for its age. It has 105k miles on the engine. The couple got too old to drive and it had been parked in their garage. Everything in the car worked and was exceptionally clean and it drove great on the test drive. One week (60 miles driven) the car began to run very rough and making engine noise. I used a Bluedriver code reader and it shows a Crankshaft Position Sensor P0016 and a P0300 random misfire. My local mechanic came over and listened to it. He says I think something is wrong with the timing chain to make that much noise and make it run that poorly. I had it towed down to his shop. He did some compression tests, examined timing chain and valves. Timing chain tensioner had failed and caused timing chain to skip.This probably occured due to improper lubrication. I had not changed the oil but was planning to change the fluids but this occured before I had an opportunity to. The cars computer said it was at 98% engine oil life. He determined there was valve damage done to the rear end of the engine. However, he told me he did not want to do an engine swap himself and suggested I pull the plug on this adventure. We also discussed the head gasket issues these engines have been known to have.

Since I liked the car and don't want to give it away I began searching for a willing, qualified, and affordable mechanic to do the repair work. Today I found and purchased an Identical 2005 Cadillac Deville 4.6 Northstar engine "Y with 79K on it. I paid $850 from a wrecking yard and it has 195-215 compression. 130 day guarantee. I think if I am going to spend money on swapping an engine it only makes sense to replace some items that are likely to fail. I am seeking helpful advice. I was thinking of having them use a new timing chain kit, the water pump, thermostat, rear main chankshaft seal, starter, Spark Plugs. I am working with a budget and realize I would exceed it if I replace too many parts. I am hoping to get this done for close to 3-$3500 including the labor. Any helpful advise it appreciated. I have not been down this road before but have read a lot. Thank You.
 

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2000 Deville Base, 2019 Corvette Grand Sport
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The only word of encouragement I can give you is I wouldn't worry about the head gaskets in a 05. That problem was virtually eliminated in the last half of the 04 model year run. Being you got a 05 I wouldn't worry about it.
 

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White Diamond '03 DHS (with DTS floor shift)
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I also wouldn't worry much about the timing chain. They generally outlast the car. The nylon guides will quickly wear in a run pattern that is frequently mistaken as needing replacement, but in fact, that's normal. Likewise the starter and rear main (unless it is leaking). WP and tensioner, maybe depending on the mileage, but they are easy to replace when and if they fail.
 
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