I have new, 2006 Mazda-3 GT that needs first oil change. I have two questions about it;
1. What is the size of wrench for oil nut?
2. If I do change oil by my self, is it that okay with my warranty, and keeping the track in Mazda's book?
Thanks!

 

Metric #17 (i think that was the one)
Not sure about the warranty. I'm keeping track of everything I do on my car

 

17mm and 6mm hex for the drain plug, I'm assuming that you have the 2.3L.

 

I think 2.0 and 2.3 are the same

 

Yes, it's 2.3, and I tried with 21mm, and did not work, it was too small!(???)
I must be had a wrong shape?
Must say, I am not mechanicaly talented. Thanks guys!

 

misha,
If you are not sure how to do it, either find someone the help you the first time or go somewhere and change it for $20.
If you live in the bay area I might be able to help
if not I can at least let you know how to do it step-by-step

 

I did change oil on my Saab, previous car........but on this one, I just coulnot find right wrench!
Thanks Ivo!