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Cut open the oil filter-see if you see chunks or flecks of metal-same story when you drain oil-do it in clean container-look for metal flecks
If you do-maybe pull oil pan-look for obvious problem
No metal flecks could mean something relatively minor
Lotta metal flecks means rebuild or replace maybe
Luck
Charlie
 

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But like TB says-genuine GM Goodwrench rebuilds or new engines are CHEAP-
$2000 CURBSIDE for his 5.7 I think
My 1998 5.7 is just $2300 curbside-NEW GOODWRENCH-not a rebuild
 
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