We've never been very good with our terms
I'm thinking in terms of 3 different approaches to a car.
Restoration - A restoration is the act of permanently changing the artifact or car. It's usually done in a effort to return the car to a previous condition.
Conservation - This is the process whereby objects are cleaned and stabilized to ensure their survival without removing the evidence of their past life.
Preservation - This is the practice of maintaining a car by providing a stable environment in order to prevent further damage or deterioration.
I'm starting to think that conservation and preservation may be the same thing. Or, they're similar.
Richard Newton