gmjoe2490
05-04-2012, 04:18 PM
I recently bought a 99 Z with 105000 miles. I haven't really drove the car hard because i'm a little worried about the oil pressure. Cold it's just over 40 psi. After warming up I would say it's about 25-30 psi. I noticed a knock at 1200-1500 rpm every now and then. What are my options? Should I change the oil pump and o-ring? Maybe the barrings too? I have heard the early LS1s had o-ring problems. I don't know when the oil was changed before I bought it so I changed it about 1500 miles ago. Any help Please....