Since this is my first post I'll try my best to update you on my situation. My 1985 Toyota w/ the 22R (107,500 miles) has been running Castrol GTX 10W30 for the past two years. This past weekend I switched over to Mobil 1 10W30 7500 Drive Clean with a purolator filter. I am now contemplating doing an Auto-RX treatment at my next change and was wondering if this seems like a good idea. After the treatment I plan to go back to Mobil 1 and use both FP and LC. Any input would be appreciated, TIA.