|
As you may know, Royal
Purple is well known in racing circles. The chemistry they use is something AMSOIL, Inc. chooses not to use in their
oil formulation. One of Amsoil's big selling points is extended drain intervals, such as our 25,000 mile and 35,000
mile oil change intervals. Some additive chemicals may cause adverse conditions when used for long periods.
Royal Purple uses a different chemistry than most oil producers . They are one of only
a handful of marketers using Molybdenum Disulfide (Moly) in their oil formulations at these higher levels.
Moly is a processed mineral that is similar in appearance to graphite. Moly has good lubricating
properties when used either by itself (in dry powder form or as an additive to oil or other lubricants). Particles of
the Moly can come out of suspension and agglomerate. Over time this may actually clog or partially clog oil filters
or oil lines and the remainder normally settles in the bottom of the oil pan. This seems to be more likely when using
extended drain intervals. The only test we ran on Royal Purple involved their 20W50 Racing oil versus our AMSOIL Series 2000
Synthetic 20W50 Racing Oil (TRO). We ran two 4 ball wear tests with different parameters, a spectrographic baseline,
FTIR scan and volatility tests. The Royal Purple showed a significantly high volatility rate with a 12.51% boil off
rate. This compares to the AMSOIL TRO with only a 4.47% volatility rating. Wear scars were also smaller with the
TRO. For example the AMSOIL TRO left a .41mm scar and the Royal Purple oil left a .66mm scar. The lower the scare
damage number the better! There was also a surprising difference in the viscosity index. The RP has a VI of 129
versus 155 for the TRO. The higher the VI, the better the viscosity stays in place at high temperatures.
Note: This information was provided by AMSOIL, Inc. Tech Department. An independent
lab tested the Royal Purple 20W-50 racing oil against the AMSOIL 20W-50 racing oil. The results are posted above. Test
results found Moly in the Royal Purple oil sample.
|
