I'm currently running Chev.supr. 10/30 in my Arx "rinse" phase, and I and the car like the oil. I'm considering running this oil even after the Arx rinse with Motorcraft FL-820S filter.(the engine: 97 4.6L sohc Ford-tbird, 91,000 miles) With about 70% highway driving, what would be the maximum safe OCI with this oil? Would this max.amount of miles be OK with this filter, too? How would it be with Pennz.HM 10/30 or 10/40? I'll have to choose between these two.(IF the Arx has stopped my little consumption completely...otherwise the Chevron 10/30 would be my choice) Thanks in advance for any help/advice.