of oil changes and milage will determine whether valve work is required or not. You can verify the tolerances/wear with the correct tools and written specifications for your model.

Best case you will not have to replace anything but valve seals. Worst case you could end up replacing a valve or two. It is all based on the frequency of oil changes.

Has your source visually looked at the condition of the valves and taken some measurements? This is really the only real way I would know.

Jim
'95 E320
'97 Honda CRV