It was my experience, this was a very worth while upgrade. In my case I used redline and the sound and feel to my car was much more smoothe than with the ford oil. Which is called Motorcraft.
The problem with motorcraft is that it is not fully synthetic. And as such, the red lines, amsoils, and royal purples are simply superior to the motorcraft. I really like the way my vehicle responded to the red line and am pretty much sold on using it in all of my cars...for ever.
Make sure that you use 4 1/2 quarts though. That is all that is required.
You might want to check the search function as there is a plethora of information pertaining to this subject. And you will most likely find a number of posts that are much more thurough than mine.
It takes some digging on their site to find it, but Royal Purple STREET oil is NOT 100% Synthetic. They kind of dance around it, but it isn't. I wish it was and I was going to run this stuff until I found out. Now, I guess I will be sticking to Mobil 1, or biting the bullet and running Redline. See Here:
Totally wrong friend. A bunch of rumors started on other boards. Some were claiming the new Mobil One was formulated using restructed petroleum molecules similar to another major oil companies synthetic oil. NO BASIS OF FACT!
A check with Mobil will tell you the real facts. Also check search on this subject, as this was covered in detail a few months ago.
I'm not sure how many of you watch Hot Rod TV (or is it Horespower TV now?), but a week or two ago they changed the engine, tranny, and rearend oil in a fourth-gen camaro and gained 8 rear wheel HP on their chassis dyno from just that change. They used Royal Purple fluids everywhere. Honestly, I would've never believed it had I not seen the dyno.
It was a manual transmission car, IIRC - I'd guess that an automatic would benefit similarly.
I put the M1 ATF in my manual, I suppose it isn't the greatest tranny fluid out there but it works great and you can pick it up locally. Here in Colorado it gets kinda cold and the M1 Synth made cold shifting very fluid feeling.
Along the same lines, Torco is anothet great lubricant company. Their 0W-20 and 5W-30 are highly recommended. Link has dyno tests including head to head with Royal Purple, Mobil One, Pennzoil amd Motorcraft. Real nice HP and Torque gains, just by using Torco Oil (especially against the Motorcraft 5W-20)!