Originally Posted by Slurpyy08wrx
So Walmart doesn't have a 1 quart of t6 can I buy the shell T 15w-40 triple protection to add the last .4 quart? I did it on my 08 but not sure if its safe for my 2013?
You can use any synthetic you like. Last winter I was using 4 qts RT6 and topping off with Subaru Syn 5W-30.