Background: Lycoming O320-E2D. It has 1200 SMOH in 1999. It was flown regularly from 1999 to 2007. It has sat largely unused since 2007. It was run up once in a while and had the oil changed at some unknown interval while it was sitting collecting dust. Today, it starts up fine, runs up fine, sounds fine, idles fine, etc. It's time spent unused has been in an outdoor tiedown in the mid-atlantic, not on the ocean. Compression is unknown. It was in the low to mid 70s in 2007. Question: What are the best practices to help nurse this engine back to life? What oil? What additives if any? How should we treat and use it? Magnets on the filter? What compression would be considered bad on this engine if it is the rings vs the valves? Looking for any and all experienced advice. Note: Keep it to the engine only. Not the airframe. And "Get another engine" is not helpful Thanks for the help!