Sounds like excessive blow by caused by high mileage . The way to help fix this is to run a High mileage oil. More wax in the oil will keep things moving.
Next you want to buy and install an oil catch can. This will allow any oil drawn from the PCV system to be caught in a container instead of being drawn into the intake plenum.
Open Wide Performance | Quality. Passion. sells them $100 shipped. They are quality baffled cans.
Here is a pic of Venom and the Proper routing of an oil catch can. make sure to hook up the lines correctly.This will keep the oil out of the intake. Off the valves and away from the spark plugs. This should stop the smoking and reassure you the engine is ready for another 100K.
Parts list needed
1. Oil catch can ( Baffled )
2. 3/8 Tee x2
3. Marine grade zip ties for a proper seal( Clamps can be used but are overkill and ugly )
4. 10 ' of Oil resistant hose like Transmission line . do NOT use fuel line or SILICONE hose.




