quote:
The statement from this company is misleading; we have seen this before
as it appears to be a cut-and-paste response to inquiries they receive
in regard to Royal Purple. Let's dissect the technical merit of the
statement. The first point which needs correction is in regard to Royal
Purple containing moly; or molybdenum. the information goes on to
state the potential problems with moly disulfide. Both of these
statement are true, however, moly molybdenum does not always equate to
moly disulfide. This is jumping to a false conclusion. One might expect
an independent oil manufacturer to be able to decipher this. Either they
can't, or they could be intentionally misleading the unknowing public -
notice how, at no point, does this wordsmith state RP contains moly
disulfide. Royal Purple does not use moly disulfide in any formulations.
The molybdenum used sparingly i.e formulations is not a solid, it is a synthetic, oil soluble molybdenum
compound which is not susceptible to issues associated with MoS2 such as
settling and/ or agglomerating as speculated.
In regard to their in house test sequences, let's utilize the first rule
of critical thinking: consider the source. Any test procedures will have
repeat and reproducibility margins of error which allow results to be
misrepresented taking one product's largest wear scar and comparing to
another's smallest. These margins in the four-ball wear test D4172,
per ASTM definition, are .12mm repeatability and .28mm reproducibility
which is significant when you factor in their results.
The figure reported on the viscosity index of the RP 20W50 racing oil is
not accurate. The VI ,Viscosity Index, of Royal Purple's racing 20W50 or
Racing 51 is >180; significantly higher than what was reported. We
believe that these results are from some used 20W50 from 5-7 years ago.
Our API 20W50 has a VI typical of 138.
The figures on volatility appear to be significantly skewed as well. The
test sequence we use for QC of our anti-oxidation properties is called
TFOUT, thin-film oxygen uptake, ASTM D4742. In TFOUT testing, our engine
oils exceed 1200 minutes. Although we typically do not use test
sequences as a part of marketing efforts, we have tested other products
in TFOUT testing for comparison. Typically other synthetics will fail
within 300 to 500 minutes in TFOUT testing; we have seen Amsoil's TRO
20W50 advertised in that range.
Regardless, one can bench race lubricants forever and never reach a
valid conclusion. We prefer to compare using applications for which the
products were intended. On the Royal Purple website is a summary of
independent third-party testing
http://royalpurple.com/techrp/summary.html illustrating the real world
benefits of using Royal Purple. In the summary, the comparitive products
are simply listed as 'premium synthetic' or 'brand name mineral' as we
choose to take the higher road in comparitive data and not cast stones
directly at other manufacturers. However, if you download the full
reports as submitted by the third-party, the products used will be
clearly stated.
