Just started working on 53 Chevy pickup. After a month, it is started. Yesterday after driving it I noticed oil dripping out from under it. There is what I'd call a collar which connects the drivetrain to what I believe to be the transmission (I'm learning as I go). That collar became unscrewed. Oil was dripping out of the drivetrain n from behind the engine. Oil pan looks good n valve cover looks tight. Is it possible oil was "slung" out of drivetrain and onto back of engine n that is where oil is coming from? I'd say over 2 days a 1/4 to 1/2 cup of oil has dripped.