i am going to replace the fluid in my 03 expy with the 4r100 trans it requires mercon v but the royal purple which is a full synthetic fluid is reccomended for mercon and dexron 3 applications so should i not use it i am afraid it won't have the anti shudder additives

 

I would NOT use RP as it is not Mercon V compatible. There is a difference between the Mercon and Mercon V fluid specs and they are not interchangeable. I do not believe RP has a Mercon V compatible fluid.

 

Ford390,

Are you sure about having the 4R100 tranny in your 2003 Expy? Because if you do Ford, at least in 2002 MY, used Mercon/DexronIII in that tranny. They specifically warned not to use MerconV in the 4R100 tranny. I'd double check to see what tranny you have and check your owner's manual for tranny fluid requirements.

Whimsey

 

yes it is the 4r100 it came standard with the tow package and it says to use mercon type v on the dipstick and in the manual

 

Ford 390, you might want to go directly to Royal Purple's website, and get a direct answer to your question from RP's Technicians. In the past, I have asked questions, and have received very through and prompt answers back within 1-3 days. This was over a year ago, but I appreciated Royal Purple being responsive to us, their customers / enthuiasts. In my e-mail question, I had also included my home address to Royal Purple along with my e-mail address. They answered my question(s) via e-mail as I have stated above. Then about 2 1/2 weeks later in the mail, I received a fat white 10X13 mailer, full of all RP products, descriptions, and testimonials (copies) from other satisfied users. I know Royal Purple makes excellent, state of the art, racing oils, used in all types of racing, especially Championship Drag Racing. If you ever heard a Mountain Motor Race HEMI, open headers, revving at 9100+ rpm, thunder echoing across the night sky, drinking in massive amounts of 112 octane gasoline, sucking cool, crisp, night air through giant twin 4 BBl carbs, if you are like me, you appreciate and respect the oil flowing through that race engine, costing more than the down payment on your house. Chances are, it's running Royal Purple's Race oil. RP, great company Ed

 

I agree, Royal Purple makes a great product! Unlike Amsoil, Royal Purple is API certified, NOT a MLM company, and is also a FTE sponser!!! With all the positives of Royal Purple, I would ONLY use Mercon V, if my tranny called for
Mercon V!!