1. Car is running very hot (110). I put the fault on the radiator and am looking for pointers as to which one to buy (Behr?) and steps for changing it.
2. Somebody borrowed it and put very bad regular in it. Since then it's been knocking and hesitating under full throttle. Any solutions?
3. Are Bosch Platinum +4s advisable for this engine?

Thank you for your help