Evans
I'm not using Evans in the Getta, but I have been using Evans in a bunch of my vehicles- started using it in 1996, in a new chevy Astro.
I also converted my 1.6 diesel Jetta in 2001, and several other vehicles. Still own the Astro and 1.6 Jetta, and Evans has quite literally saved both vehicles from the scrap heap by preventing catastrophic cooling system failure.
I don't know if it is compatible with my 1.9TDI Getta. I didn't convert Getta because I wasn't sure I wanted to keep her. Still don't know If I'll keep her. (Getta's a lot of fun, but it's a bit too much car for me-I like to drive slow-my wife says I like to "putter along" )
On one hand, I love Evans, because it works exactly as advertised- zero pressure, zero corrosion, zero maintenence, and I never have to worry about overheating again.
Downside of Evans: It is REALLY expensive, I cannot get it locally, so I have to pay/wait for shipping , and probably the # 1 problem with the stuff is that it is a real PITA/impossible to get all of the old coolant out of your system. I would not spend the time/effort to convert a vehicle, unless I was planning on keeping the vehicle forever(but that's just me).
What I did to remove the old coolant/ convert to Evans: Park the vehicle on a steep decline(pointing down hill), removed the upper and lower radiator hoses as well as the thermostat, got my two burly boys to help me rock the vehicle, and then rigged an air pressure hose to the engine block top to blow out as much coolant as possible. I did not pop out the freeze plugs in the block, because I couldn't figure out how to do that without pulling the engine (space was too tight).
I then filled w Evans, and drove with the expansion tank cap/radiator cap loose. I think it took abt 3 months to actually boil off the water that remained in the system. You know when the water is all gone, because you can tighten the expansion tank cap/radiator cap, drive till up to operating temp, and then squeeeeeze the upper hose- zero pressure!
Evans has some new stuff for flushing/pretreatment - probably what I will do when I convert wife's Nissan.
I run all my vehicles with stock thermostats,- I know from personal experience that you can run Evans way past the temp gauge red line safely, but I never did it intentionally. Both times it was because I had lost a water pump, and was far, far away from a service station.