''eyvallah'' is used between men and it's an intensive, dignified, intimate and serious way of saying thank you.''sağol'' means be alive and this expression is also used to say ''thank you''.Eyvallah and sağol can be just used for daily language. You should use ''teşekkür ederim '' while speaking formally but you can also use in all conditions. (No matter who you talk with)