This page deals with Royal Purple branded oils
Royal Purple High Performance has mediocre performance.
N/A = NO ADDITIVES
M# = SQUID INK ADDITIVE MIX VARIATION
C# = CUSTOM MIX, SEE UNDER CHARTS FOR MORE DETAILS
High Performance 5W30
Recommended blend: M7 PLEASE READ BELOW FIRST.
SLR-3 Scoring ---
- N/A: 71.79
- M7: 75.79
- M10: 74.19
Additives seemed to do relatively little for this oil in comparison with other base oils. While Royal Purple has mediocre120 minute performance, it's initial performance was far less than ideal. It seems they add a color pigment to their oil to make it purple. They must assume that these pigments will be filtered out by the oil filter (this will cause near instant degradation of performance in the oil filter). This is another issue with Royal Purple that makes it a mediocre (at best) oil.
With M7 and M10: at the 60 minute mark there was a 20% reduction in cylinder weight loss, and a near 9% reduction in scar length. However, this was at the cost of more than 20'F increased temperature. In both cases however, oil temperatures were within acceptable ranges.
- a secondary run with M6 was done reusing oil from the first test on new contact patch. This was to test how Royal Purple improves after burning off and removing the non-lubricating pigments. The 30 minute stress test shows that this oil improves after heat cycling and filtering for enough time. Other less expensive oils have better initial performance. There was a near 27% decrease in scar size during the 30 minute stress test using recycled, heat-cycled oil from the previous test.
The large number of non-lubricating additives in Royal Purple left noticeable and rather severe scarring on the surface of the cylinders. Most other oils produce scarring in a linear milling fashion, but this oil produced scarring that would actually rip apart the metal surface in a very negative way. Therefore, we must recommend against ever using this particular oil.