Hi all, been lurking, time to post! I have a 1978 Fairmont with a 3.3l straight six. The odometer reads about 82k km, but it's probably been wrapped once. In excellent condition as a daily driver. I bought it about a year ago, but it could easily not be the original motor I suppose. Was due for an oil change so yesterday a put in some Valvoline 5-30, and a new Wix extra-large filter, Motorcraft FL299 style. I also received my bottles of AutoRX this week, so my question is should I wait a while before putting the RX in, or just go ahead and start now. If I start now, at what mileage should I change the oil again?