My baby is aproaching 5 years (Build Date Dec 2003) and I want to change the anti-freeze. It still looks good but, looks can be deceiving.

Questions are What the best anti-freeze and what is the best way to flush the cooling system.

I want to do it myself as the local Chysler deal is about out of business(has less then 10 used cars on his lot) and Mercedes dealers are far away.