Just started working on my newly acquired 2003 turbo. One question in my previous 98 boxster I did the coolant change every 5 years. I was not sure if this was ever done on this car but wondered if adding a coolant additive like water wetter into the coolant tank would ever get into the system or does it just sit in the tank?

 

it will circulate in. Flush the system with G13 coolant.

 

Water wetter is meant for distilled water and skipping coolant. Great for track cars in the event of leaks & spills. Less slippery and safer.

Use Porsche or VW coolant with distilled water and skip the WW.