Driving the kids to school about a week ago, oil pressure dropped, dash said stop engine. About a minute later I pulled into a gas station, and because of the known oil burning issue in these vehicles I purchased 2 quarts, popped them in, no more problems. Assumed that oil was low, popped in 2 more quarts when I got home. Didnt think to much more about it other than I was going to change the oil and filter the next paycheck. About 2 days later, I started getting a LOUD knocking noise from the engine. Decided to change the oil right away. Pull the dip stick, and it was overfull. Drained almost 8 quarts out. Replaced oil, still have the knocking. Took it on the highway when I parked the loud knocking is still there, just not as loud. The old oil did not have any metal in it at all. What are your thoughts on this? I ordered an engine rebuilt kit on ebay for $360. Am I going to have to replace crank shaft? Any chance its just a REALLY bad lifter? Should I replace the lifters and push rods?