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Old 11-17-2001, 02:44 PM   #1
Tex-WReX2
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Default Royal Purple Motor Oil

Well, I hit 10k miles in the wrx and decided to go to synthetic. After viewing the pumps in our plant that use another form of Royal Purple oil, I decided to give it a shot. I am also able to get it through work at a great price. I will pass on any fuel savings. The first thing I did notice was valvetrain noise was reduced. I am running the 10w40 at this time because as you know, Houston really has two seasons. Real hot ans kind of cool.


I am always looking for a little edge. And we all know, friction eats horsepower. Once I have an obd2 logger working perhaps I can compare temps and other variables. Fell free for any questions.
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Old 11-17-2001, 08:15 PM   #2
NotoriousWRX
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Good choice!
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Old 11-17-2001, 08:36 PM   #3
Altered BeasT
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Amsoil vs Royal Purple:
This is just an FYI... it's not to start a debate, just throwing some number specs of each.

Viscometrics 40 degrees C cSt
- The lower the number, the better because it means better flow at low temperatures. This is important for the many in colder climates:
Amsoil Series 2000 0W-30.....57.9

Royal Purple 5W-30...........62.5
Amsoil XL-7500 5W-30.........58.4
Amsoil 5W-30.................59.5

Royal Purple 10W-30..........61.8
Royal Purple 10W-30..........67.3
Amsoil XL7500 10W-30.........64.0
Amsoil 10W-30................64.3

Royal Purple 10W-40..........94.0
Amsoil 10W-40................79.2


Viscosity Index
- The higher the number, the less change due to temperature.

Amsoil Series 2000 0W-30......188

Royal Purple 5W-30............160
Amsoil XL-7500 5W-30..........160
Amsoil 5W-30..................197

Royal Purple 10W-30...........144
Royal Purple 10W-30...........149
Amsoil XL7500 10W-30..........148
Amsoil 10W-30.................177

Royal Purple 10W-40...........149
Amsoil 10W-40.................183


Pour Point
- Again for those of you in colder climates. This is the temp that the oil will still pour at.

Amsoil Series 2000 0W-30.....<-76

Royal Purple 5W-30............-44
Amsoil XL-7500 5W-30..........-60
Amsoil 5W-30..................-60

Royal Purple 10W-30...........-40
Royal Purple 10W-30...........-49
Amsoil XL7500 10W-30..........-54
Amsoil 10W-30.................-60

Royal Purple 10W-40...........-49
Amsoil 10W-40.................-54



Flash Point
- The higher, the better able to withstand high temperature. This and the next one are important, especially with the heat our turbos put out, or if
going to the track and running hot.

Amsoil Series 2000 0W-30......460

Royal Purple 5W-30............395
Amsoil XL-7500 5W-30..........464
Amsoil 5W-30..................442

Royal Purple 10W-30...........400
Royal Purple 10W-30...........400
Amsoil XL7500 10W-30..........471
Amsoil 10W-30.................446

Royal Purple 10W-40...........400
Amsoil 10W-40.................450


Fire Point

Amsoil Series 2000 0W-30......489

Royal Purple 5W-30............435
Amsoil XL-7500 5W-30..........478
Amsoil 5W-30..................442

Royal Purple 10W-30...........435
Royal Purple 10W-30...........445
Amsoil XL7500 10W-30..........478
Amsoil 10W-30................. ?

Royal Purple 10W-40...........435
Amsoil 10W-40.................450


Total Base Number (TBN)
- This is basically the additive package that keeps the oil alive. The higher the number the better. Most of these numbers for Amsoil are the
minimum they allow, usually the numbers I've seen are between 12 and 13!

Amsoil Series 2000 0W-30.....11.4

Royal Purple 5W-30...........10.5
Amsoil XL-7500 5W-30..........9.0
Amsoil 5W-30................>11.0

Royal Purple 10W-30..........10.5
Royal Purple 10W-30..........10.5
Amsoil XL7500 10W-30..........9.0
Amsoil 10W-30...............>11.0

Royal Purple 10W-40..........13.0
Amsoil 10W-40...............>12.0


In most cases the Amsoil beats the RP numbers, even their lowest line, the
XL-7500, which I've been told is pretty comparable to Mobil 1. I understand that Mobil 1's TBN numbers are around 9 as well.

A friend of mine who sells oil passed this info on to me... and I'll pass it on to you. I looked up a few of the specs and they are correct.
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Old 11-17-2001, 09:16 PM   #4
aZiator
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This table looks oh so familiar!!! I switched from mobil 1 to the royal purple Racing41 in my Z and was very impressed with the difference in valvetrain noise at the first start-up. I am planning on using amsoil in the WRX, but I sure do love the RP and the way it looks after oil changes.
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Old 11-17-2001, 09:46 PM   #5
Tex-WReX2
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Thanks Altered beast. I am always looking for good tech info.

What is the cost per quart for Amsoil?
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Old 11-17-2001, 09:49 PM   #6
Altered BeasT
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If I remember right, I usually see it for $7, but I was at a place here in Ma (Redline Performance) and it was $5 something. I think $5.99. It's a lot harder to find.
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Old 11-17-2001, 10:05 PM   #7
Eric SS
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Although I use Mobil 1 in my road car, The only thing I will use in my race cars is Royal Purple, and that is here in Phoenix. It is the best

Eric
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Old 11-18-2001, 05:36 AM   #8
invisibleman
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i haven't used royal purple but i've heard alot of good things. me i'm kinda stuck on motul because on my bikes nothing else came close to it.
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Old 11-18-2001, 03:16 PM   #9
Tex-WReX2
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Same here invisibleman

I use it in my current bikes (98 gsx-r 750, 2000 gsx-1300r)

I have used it for years and as you say, nothing comes close
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Old 11-18-2001, 05:13 PM   #10
MrSwede
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Where can I find RP or Amsoil. I live in Northern KY, about 15 minutes from Cincinnati. I have looked around and can't find either brand. Any suggestions?
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Old 11-18-2001, 08:59 PM   #11
Tex-WReX2
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........has it here in Texas
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Old 11-19-2001, 01:58 AM   #12
invisibleman
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hey Tex-WReX2 are you on the www.gixxer.com forum also? if not drop by. sorry for all those who didn't care but had to suffer through this little sidetopic. oh and i got an 01 750
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