Can D4 be mixed with Mercon V

[novadude]

Can I do a "drain and fill" with Redline D4 in my Ford AODE trans? I am currently running Havoline Mercon V. Is D4 compatible with all Merc V fluids? Will I see any benefits by replacing ~1/2 of my fluid with D4, or would this be a waste of money.

A complete flush will not be an option, so please do not suggest it!

 

[Schmoe]

If your trans say use Mercon V only, then I'd stick to that. To this date, there haven't been any really good suitable replacement for Mercon V.

 

[Ray H]

Some people have to learn the hard way, Schmoe. DaimlerChrysler trannies are pretty particular, too. And, unlike Mercon V, ATF+4 is only available through DaimlerChrysler dealers at prices around $8.00/qt.

 

[Rand]

That is what I am going to do. Get as much out as possible then refill with D4.. I wouldnt worry about it.

 

[JTK]

I dont know of anyone who's tried RL D4 on an AT spec'd for Mercon V yet, but I bet it will do just fine mixed 50/50 with a dump & fill. Worst case scenario, you'll have to dump a good batch of RL & go back to straight Mercon V if it bangs thru the gears too hard or goes the other way & slips or shudders

. Any reason why you want to switch? Merc V is supposed to be pretty hardy stuff.
G/luck
Joel

 

[novadude]

I'll just stick with Mercon V.

By the way... my trans is not orignally spec'd for "V", but Ford issued a TSB recommending it be used in some of the older models, including mine.