2011 CXL engine replacement

SapphicPirate7

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Buick Ownership
Buick Lucerne CXL 2011
I've had a 2011 Buick Lucerne CXL for around 7 years now and it's been great.

Recently however, I was just about to pull into work going like 15 mph when I noticed the RPM was jumping up but I wasn't getting any speed. Then the dash flashes Service Stabiltrack and Service Traction Control before the entire engine started shaking with the Engine light flashing.

I managed to pull in and park it but no longer started and shaked really badly if I tried.

I took it to a mechanic who now says it's a piston and the whole engine will need replaced for around 3k.

Does anyone have experience with replacement engines in Lucernes? I'm not sure if it'll be worth the price even though I'd rather that than get a new car at this point.
 
As mentioned a second opinion unless you trust the shop. It's a GM Corporate engine transmission, assuming it's 3.9L, 3K may be worth it depending on the rest of the vehicle condition. Additional details are missing if it's a rebuilt or used engine, warranty, etc
 
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