It’s important to provide cooling for Mazda’s engine with 2.0 liters volume. In 2002 the company produced vehicles with 2.3 engine having code of L3C1. There are some conditions in servicing cooling module at Mazda Atenza. Otherwise Atenza made in 2006 won’t serve you long enough. Only Red antifreeze type is suitable and you’ll need 7.5 liters of it.
To endure car life take only Red antifreeze and pour not more or less than 7.5 liters. Produced in 2007 the 2.0 engine in Atenza model will serve longer by this. Look at Mazda’s requirements and make your 2005 Atenza serve longer and with no problem. A lot of L813 motors are used long in Mazda cars but only with good service.