In 94 you had the LT1 350 V8.
275 horse.
Loook in your owners manual, I use syntheric blend 20w50
Depends on what motor you have.
5w30 weight.
10w30
DOT 3
10w30
5w30 synthetic blend motor oil 4.7 qts.
SAE 10w30 any major brand.
All cars & trucks made in 1994 and after have to use R134 (federal regulations). 1993 & earlier use R12.
R134 _ Well Mine did
Motor support porbably bad.