I recently had some transmission work done on my Ranger, which requires Mercon V. The shop filled it with Maxlife, which is what they use in just about everything. I recall that Valvoline used to claim that Maxlife is officially licensed for Mercon V; I'm not sure if that's still true. Their website or product data sheet don't mention it, and it's not listed as even "suitable for" Mercon V on the bottle.