i have motul coolant exprert ultra and i freind of mine who will change the coolant for me told me that when he drains the coolant some of the old coolant will still stay and motul coolant isnt the same as subaru coolant and that i sholud not mix it.
can i change my coolant with motul witout problems

 

i thought the coolant was just water,if its the one in the header tank your talking about.

 

did someone change there coolant with motul expert ultra and did someone use Subaru Cooling System Conditioner