sviper

Any one with a manual transmission, has nay one changed their trans fluid to Royal Purple? If so nay adverse actions and what to expect.
Also considering changing rear dif to royal purple.

rmays06

I've heard if you do both its close to 9 HP. I only did the engine and I noticed a difference!

Gearhead

If you could gain 9 horsepower by changing the transmission and rear differential fluids to this Royal Purple stuff, then that means that without Royal Purple, they would generate this much extra heat:
9 horsepower * 746 watts/hp = 6,714 watts. This does not seem even remotely reasonable, especially considering that Ford is using Auto Trans fluid in the manual transmission, and a very wide-range viscosity fluid in the rear (75W-140)

Fazm

horsepowertv did this test on a camaro. engine oil, trans/ rear end

they gained 9rwhp

what they dont tell you, is that this is all from DIRTY fluids.

change all the fluids with clean oil, dyno it, then royal purple, and dyno it. bet theres 1-2rwhp tops, which could be dyno error.

sviper

not going to dyno mine but she is at the shop right now getting fluids changed tranie and rear dif to royal purple.

rmays06

WOW man that is some crazy smart info. How does someone that kinda knowjunk let alone remember it.
Thanks for the info guys. I do like the oil thou!

theedge67

To top it all off, the trans. and the rear end lube is ALREADY synthetic from the factory!! Is a different brand of synthetic really going to make that much difference? highly doubtful. I would be more worried I would screw something up by changing it than by the .5 -1 hp I might gain.

Fazm

the transmission is mercon V, and the rear is synthetic.

sviper

After driveig no mor whining from the trans, also feels a little mor pepie. wasent even trying and got a god scream form second gear also noticed that going in to reverse and 1st no problems, before tough to get in to reverse and 1st

pyrat

I would tend to agree. One of the car shows on Spike did a test which involved replacing the OEM lubricants with Royal Purple. The test vehicle was a 4WD pickup so they replaced the lubricants in two rear ends, the transmission, the transfer case and the engine. The before and after dyno showed a 10HP gain. If we were to consider this as a linear gain, that would be 2HP/drivetrain component. This would indicate a gain more like 6HP on a Mustang (engine, transmission, rear end). Of course, nothing says the gain has to be linear. The only way to know for sure is do your own before and after dyno tests.