I've been cleaning out my deceased uncle's garage lately and have come across some old, unopened oil. The "newest" oil is dated 1989 and is Quaker State and Pennsoil in SAE30 and 10W30 & 40. They are in plastic qt. jugs. The older oil (not sure of the date) is Arco oil and is in cardboard cilinders with metal end caps. The Arco oil is mostly SAE 30. I even found some Atlantic oil made for outboard motors. Anyone have an idea if this is good still and what would I use it for? Thanks.