If you start it up in the mornings and it rattles pretty good then quietens down a lot when the oil light goes out then it is in irrepairable rod bearing. There can be loose torque converter bolts and bad harmonic balancers and very loose valve settings but anyone that has heard the rod knock before know what it is almost immediately and sighs because it means pulling the engine.
All it takes is one time for the oil level to get to low to be picked up and the damage has been done, from slight to major. Putting thick oil in will help, like STP or others like these, but..........
Let us know.
Russ
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