Ew
 

Mazda CX5 Turbo brand new 10 months old , need first service done, do I have to go back to the same dealer or can I go to my own mechanic?
And doing so will I void my Warrnty with Mazda ?

Welcome to the forum

You can use your regular service shop . Just keep the invoice, service order for your records to show the service was done.
Using another dealership or a private service shop as well the use of any none oem parts (as long as there is no USE ONLY) information) can be used and it will not void you Mazda warranty.
If you are in the USA we have the ;
Magnuson–Moss Warranty Act - Wikipedia
Magnuson-Moss Warranty Act (MMWA) | Auto Care

Be aware, choosing not to use Mazda for your servicing may greatly affect any out of warranty issues &/or effort or care shown by Mazda.


( if you scratch their back, they will scratch yours )