Hello, I have 3 questions in my luggage. First of all I mostly drive short distances and if possible also extra times long tours. On the safe way I want to be there with a motor oil which fits to that driving profile. Which can I take there? I30, petroler, 1.4 109hp Second, for the same reason, I would like to install (let) a water/oil heat exchanger? Which do I take? Can I also install it myself? Third, I hear ratters from the engine room, probably the Control chain? Is it possible to reset it? How much does it cost? In addition, the car smells quite strong and loud like a coke can? What could that be?