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Q:

My oil light comes on & knocking in the morning at start up. on 1994 Buick Roadmaster

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The oil filter came off on the interstate'.
(1) Answer
Sounds like your engine has unwanted/undesired bearing clearance caused by lack of oil. Who ever did the oil change is liable.