Royal Purple fluids

JasonWatts · **Posted:** Thu Nov 28, 2013 11:07 am

Thoughts on Royal Purple over redline fluids for the Transmission and Diff?

I was planning on changing the fluids over the holiday break, but never thought to order them. At this point, I can get the Royal purple before the weekend ends, but the Redline I am looking at Monday as the earliest.

Thanks for any input.

JasonWatts · **Posted:** Thu Nov 28, 2013 1:30 pm

So I decided to wait a few days and just buy the redline. Still interested to know what people think of royal purple, but will be putting redline in

BretLuter · **Posted:** Thu Nov 28, 2013 10:52 pm

viewtopic.php?f=25&t=12855

If you need MTL or 75W90 gear oil, I've got you covered.

MarcusMcRae · **Posted:** Tue Dec 03, 2013 8:44 pm

Redline>Royal Purple.

Ryan Holton · **Posted:** Wed Dec 04, 2013 9:13 am

The Royal Purple in my SVT transmission is LIGHTYEARS better than Amsoil stuff I took out.

YMMV, FWIW, EIEIO

MarcusMcRae · **Posted:** Wed Dec 04, 2013 9:46 am

Ryan Holton wrote:

The Royal Purple in my SVT transmission is LIGHTYEARS better than Amsoil stuff I took out.

YMMV, FWIW, EIEIO

Did you try the fancy ford branded synthetic mtf? Kate's focus liked that stuff.

I've tried RP trans fluid a couple times and never liked it as much as redline.

Ryan Holton · **Posted:** Wed Dec 04, 2013 10:11 am

MarcusMcRae wrote:

Ryan Holton wrote:

The Royal Purple in my SVT transmission is LIGHTYEARS better than Amsoil stuff I took out.

YMMV, FWIW, EIEIO

Did you try the fancy ford branded synthetic mtf? Kate's focus liked that stuff.

I've tried RP trans fluid a couple times and never liked it as much as redline.

Nope but I hear good things about it.

RobLupella · **Posted:** Wed Dec 04, 2013 11:35 pm

I've used RP in the Vette since I got it. I get great oil mileage and it is purple and tastes like grape juice

michaelsmiller · **Posted:** Fri Dec 06, 2013 5:19 pm

I use RP in the Vette, Miata, and MazdaSpeed 3. It works pretty well, after 8 years of AutoX the Miata still shifts better than any car I have ever owned and no rear end noise even though it has pulled a trailer. I have replaced two clutches, so the car hasn't been babied. What I didn't like about Redline is that they don't mention having any corrosion protection tike like Zinc and Phosphates. The RP rear end oil is marine certified which means corrosion inhibitors are in the fluid. Last summer at CMP Jerry, indentical yellow Corvette, had the trans overtemp warnings pop on during his track runs and I never did. He ran stock ATF in his trans, I ran RP SyncroMax. What sold me on RP is that I had a Jeep Cherokee that had grinding syncro's at 110K miles, I put in RP and had no more grinding even when I sold it at 180K miles. It also towed a 3200 lb boat about 20 weekends a year for 12 years. I don't use RP for engine oil cause I'm basically cheap.

Rob Keehner · **Posted:** Fri Dec 06, 2013 7:31 pm

I put royal purple in one of my old BMWs. 4 months later I crashed it. So avoid the stuff.

JerryMaloney · **Posted:** Tue Dec 10, 2013 2:53 pm

michaelsmiller wrote:

I use RP in the Vette, Miata, and MazdaSpeed 3. It works pretty well, after 8 years of AutoX the Miata still shifts better than any car I have ever owned and no rear end noise even though it has pulled a trailer. I have replaced two clutches, so the car hasn't been babied. What I didn't like about Redline is that they don't mention having any corrosion protection tike like Zinc and Phosphates. The RP rear end oil is marine certified which means corrosion inhibitors are in the fluid. Last summer at CMP Jerry, indentical yellow Corvette, had the trans overtemp warnings pop on during his track runs and I never did. He ran stock ATF in his trans, I ran RP SyncroMax. What sold me on RP is that I had a Jeep Cherokee that had grinding syncro's at 110K miles, I put in RP and had no more grinding even when I sold it at 180K miles. It also towed a 3200 lb boat about 20 weekends a year for 12 years. I don't use RP for engine oil cause I'm basically cheap.

I switched to the Royal Purple after that event and the overtemp warnings were gone. Out of three identical Z06 Vettes running that day, two with RP had no high temp warnings and the one running soemthing different showed high temps. I am sold on RP.

JamesShort · **Posted:** Tue Dec 10, 2013 3:01 pm

JerryMaloney wrote:

michaelsmiller wrote:

I use RP in the Vette, Miata, and MazdaSpeed 3. It works pretty well, after 8 years of AutoX the Miata still shifts better than any car I have ever owned and no rear end noise even though it has pulled a trailer. I have replaced two clutches, so the car hasn't been babied. What I didn't like about Redline is that they don't mention having any corrosion protection tike like Zinc and Phosphates. The RP rear end oil is marine certified which means corrosion inhibitors are in the fluid. Last summer at CMP Jerry, indentical yellow Corvette, had the trans overtemp warnings pop on during his track runs and I never did. He ran stock ATF in his trans, I ran RP SyncroMax. What sold me on RP is that I had a Jeep Cherokee that had grinding syncro's at 110K miles, I put in RP and had no more grinding even when I sold it at 180K miles. It also towed a 3200 lb boat about 20 weekends a year for 12 years. I don't use RP for engine oil cause I'm basically cheap.

I switched to the Royal Purple after that event and the overtemp warnings were gone. Out of three identical Z06 Vettes running that day, two with RP had no high temp warnings and the one running soemthing different showed high temps. I am sold on RP.

Well let's just back up there regarding this association between RP and not overheating. ATF is basically SAE 10 weight oil with a bunch of detergents/additives in it. RP Syncromax is likely a 75w80 - 75w90 gear oil with a lot of friction modifiers to make it work well in synchronized transmissions. SAE 80 weight gear oil is equivalent to ~30 weight engine oil (say 10w30) and 90 weight gear oil is equivalent to approximately 40 weight engine oil (say 10w40). So to make an apples to apples comparison we are saying that 10 weight engine oil in your transaxle is more likely to overheat than 30-40 weight engine oil in your transaxle and I think that would apply regardless of what that particularly 30-40 weight engine oil might be, RP or not

. Given the definition of viscosity and how the shear rate and temperature of oil are related, these findings are completely obvious to me.

tl;dr

Don't run 10 weight ATF in your Z06 transaxle on track.

Ryan Holton · **Posted:** Tue Dec 10, 2013 3:16 pm

michaelsmiller wrote:

I ran RP SyncroMax.

That's what I put in my SVT, its good stuff. I just couldn't remember the name.

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