Given the age of the cars mate its only normal you will find such issues.
Some are worst than others. In my case shes really bad.
The problem I have is that my car has had a hard life in Japan and it is evident that she has been in a bad accident.
Its was repaired but very poorly (in Japan) and ever since I've owned the car I have been struggling with it chassis speaking.
It was only a matter of time before nature eats away at it.
Until I have considered all my options I am going to empty all the E85 full it up with 98 and put the covers on.