I've been having a small oil leak which I kept an eye on but have not addressed yet due to lack of time. Yesterday I put the van on stands and checked from the top and bottom. The oil seems to be coming from the top rear part of the engine but I could not see exactly where. Any ideas are welcome, I need to dig in and take a closer look in the near future. I need to do a valve job sometimes this spring so hopefully by then I can identify the leak and address at the same time.