Royal Purple 20W-50

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09 Oct 2012 14:10 #11737 by wallyp
Royal Purple 20W-50 was created by wallyp
The old version of Royal Purple 20W-50 has a higher level of ZDDP than current production, according to the distributor that I talked to yesterday.

I have never used Royal Purple, but internet chatter says that it is good stuff. The local distributor has about twelve cases (twelve quarts/case) that they are closing out at $5.76/quart, plus shipping. Not a give-away price, but not bad.

You can call them at 1 (770) 426-6070. Local pickup next to McCollum Airfield, in Kennesaw, GA, or actual cost of UPS shipping. They take credit cards over the phone.

I have no personal knowledge of the oil or the company, and no affiliation.

Wally Plumley
928 Specialists
www.928gt.com

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09 Oct 2012 17:58 #11738 by pcar928fan
Replied by pcar928fan on topic Royal Purple 20W-50
I used RP tranny fluid in my auto box on my '88. After about 10k track miles and 20k street miles it smelled burned up and so too was my auto trans! NOT GOOD! That does not mean their fluids are bad or their oil is, but I tell you I won't be using their stuff after needing to replace a trans in my car...

James
78 Silver / Black-white #295
84 Ruby Red / Black AO84
88 Dark Blue / Linen-Black
92 Polar Silver / Dark Blue 92EURO
93 Arrow Blue / Black

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11 Oct 2012 00:14 #11771 by 928mac
Replied by 928mac on topic Royal Purple 20W-50
Does R Purple have the same torque as Amsoil :D:rolleyes:

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31 Oct 2012 19:03 #12222 by ROG100
Replied by ROG100 on topic Royal Purple 20W-50
I use and also recommend RP 20W 50 for our cars due to the high content of ZZDP which is essential for our engines.

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31 Oct 2012 19:53 #12224 by pcar928fan
Replied by pcar928fan on topic Royal Purple 20W-50
Roger what is the cost of that per qt? I have used Mobil 1, Castrol Syntec and plain old Castrol Dino oil over the years. All in 20/50 or as close to it as I can get...

James
78 Silver / Black-white #295
84 Ruby Red / Black AO84
88 Dark Blue / Linen-Black
92 Polar Silver / Dark Blue 92EURO
93 Arrow Blue / Black

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31 Oct 2012 20:57 #12226 by Kiln_Red
Replied by Kiln_Red on topic Royal Purple 20W-50
I've used Mobil1 15W-50 for forever. Been a happy customer the whole time.

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08 Nov 2012 17:28 #12406 by ROG100
Replied by ROG100 on topic Royal Purple 20W-50
We moved away from Mobile 1 when they reduced the level of ZZDP to stop it screwing up cats. Check every jug you buy to make sure it has the right level of ZZDP or move to RP or another good brand.
ZZDP is absolutely essential for our cars - do without it at your peril.

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08 Nov 2012 18:59 #12414 by Kiln_Red
Replied by Kiln_Red on topic Royal Purple 20W-50

We moved away from Mobile 1 when they reduced the level of ZZDP to stop it screwing up cats. Check every jug you buy to make sure it has the right level of ZZDP or move to RP or another good brand.
ZZDP is absolutely essential for our cars - do without it at your peril.


1200ppm is the consensus suggested requirement, correct? Mobil 1 15W-50 fits the mold if this is the agreed upon number IIRC.

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08 Nov 2012 20:20 #12423 by the flying scotsman
I use ZRod 20w50 by Amsoil......meets the ZDDP requirement :)

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08 Nov 2012 22:27 #12432 by 928mac
Replied by 928mac on topic Royal Purple 20W-50

I use ZRod 20w50 by Amsoil......meets the ZDDP requirement :)


+1

or I guess it is + 10.5

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11 Nov 2012 14:26 #12504 by ROG100
Replied by ROG100 on topic Royal Purple 20W-50
For normal street use the concensus is above 1100 and for track use 1750.
For street use I recomend as a minimium 20W 50.

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11 Nov 2012 14:44 #12506 by Kiln_Red
Replied by Kiln_Red on topic Royal Purple 20W-50
15w-50 probably makes more sense for me as I sometimes drive late in to the year. My 928 does see freezing temps every now and then. On the hottest day of the year, my oil pressure will never fall below 3 bar whether in Nashville traffic or not.

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12 Nov 2012 11:53 #12522 by linderpat
Replied by linderpat on topic Royal Purple 20W-50

We moved away from Mobile 1 when they reduced the level of ZZDP to stop it screwing up cats. Check every jug you buy to make sure it has the right level of ZZDP or move to RP or another good brand.
ZZDP is absolutely essential for our cars - do without it at your peril.


Roger - I have looked, but have never, not once, seen a ZDDP level on an oil jug in any store where I've bought motor oil. That includes all of the major auto parts stores. Of course, most of the clerks that work in those places don't even know what it is. Still, where on the jug is the ZDDP content listed?

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13 Nov 2012 13:23 #12535 by mm928
Replied by mm928 on topic Royal Purple 20W-50
Sometimes you can get that info at the manufacturer's web site. For me I decided to use Rotella's replacement oil they now market as a replacement for the one they used to sell with ZDDP in it.
Their web site has some very good technical info. The new oil has better numbers than the old one.

But I agree, the best solution is to use an oil that has it, and in sufficient quantities.....the question is, what happens if they all stop using ZDDP? :eek:

At first I resisted the idea of spending that much on oil. But now that I see I only need to change it once per year at most, it is not as hard to swallow.

Right now I am very happy with Rotella considering my driving habits and location, but the option to change is always on the table.

1983 928S - 16v 4.7L L-Jetronic
Dark Grey w/ Blue Leather
85/86 exhaust manifolds
Y-Pipe
SS Hi-perf Cat
S4 springs
Bilstein shocks
Air pump delete
VIN: WP0JB0926DS861180
- - Isn't Life great? - -

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