Your owners manual will state when the valves need to be checked.
Nobody can KNOW if your valves need to be adjust untill they check them.
Most dealers will have a price to Check the valves...and if you talk to them you will find out that IF 1 or 2 or 3 need to be adjust there will be another cost.
So, what is it they are doing exactly?
ôLife should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming "Wow!
Hunter S. Thompson