little puddles of oil showing up in my air cleaner and wetting the filter. Should I use air pressure and blast the return tube to sump to check for blockages or pour oil down tube and see if drains quickly? Is it worthwhile to clean strainer/filter in air cleaner by bending up metal tabs and washing with solvent -this car at 356,000 miles has some pretty good blowby but has always had regular maintenance, etc. I am replacing valve stem seals today and will chase oil passages at the same time as I am curious to see if there are any blockages. This car runs great, fires immediately and did so with very poor valve clearances -