This is the Oil Analyzer report you will receive from your Mustang's oil sample. This is from a '98 4.6L SOHC V-8 with 191,000 miles. Sodium levels (6) indicate some coolant in the oil. High nitrate levels (20) demonstrate this engine's high mileage because there's a lot of blow-by due to worn pistons and rings. Ironically, overall numbers are normal in the "1" range.