why is my airfilter ful of oil ?

One test you can do for the compression rings being shot is to just accelerate hard; you will pretty much inevitably get a lot of smoke out the exhaust with shot compression rings under hard acceleration.

Your PCV hose to under the carb sounds OK and clear. I would still replace the PCV and make sure you have the right part. Mkee sure you can blow through it towards the carb.