I was reading in THIS THREAD about the tranny fluid "cocktail." I asked this question, but didn't get a response. So, I decided to start a new thread!
I went to Advance Auto parts a while back to get some oil and tranny fluid... They had the Penzoil Synchromesh, but they didn't have any Valvoline 75w-90. All they had was Valvoline "Durablend" 80w-90, and Mobil1 synthetic 75w-90. I didn't really want to use either one because, from what I've read, the Valvoline 75w-90 dino is the best stuff to use with the Synchromesh.
So, here's my question:
My car only has a little over 8,500 miles on it. Would it be okay for me to just drain a quart of what's in there (stock/factory fluid), and replace it with one quart of Synchromesh, or should I wait until I change it all with Valvoline 75w-90 dino?