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 Royal Purple 20W-50.........170.0
Amsoil 20W-50...............121.4
Amsoil Series 2000 20W-50...131.8 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 Royal Purple 20W-50...........138
Amsoil 20W-50.................169
Amsoil Series 2000 20W-50.....155 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 Royal Purple 20W-50...........-44
Amsoil 20W-50.................-33
Amsoil Series 2000 20W-50.....-47 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 Royal Purple 20W-50...........460
Amsoil 20W-50.................457
Amsoil Series 2000 20W-50.....474 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 Royal Purple 20W-50...........470
Amsoil 20W-50.................457
Amsoil Series 2000 20W-50.....532 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 Royal Purple 20W-50..........10.5
Amsoil 20W-50...............>12.0
Amsoil Series 2000 20W-50...>11.0 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.
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