Leaking down isn't as much of an issue on old engines as the problem of taking 10 minutes to pump back up. Sounds to me more a problem of needing to run a can of chemtool in your oil for a few hundred miles then changing the oil. Also run a filter if you don't already.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.