The engine oil cooler is not typically a component that goes bad, but should be replaced after any catastrophic engine failure. Any time metal is pumped through the engine from internal failure, it can accumulate in the oil cooler. Due to the stack plate design of the oil cooler, cleaning out that debris can be nearly impossible. The best way to protect a new engine investment is to put a new cooler on to prevent any contamination.
GM Part number: 19210615