[ryude]

Originally Posted by DSR2409

That is not true, I don't know where you heard that...the HPS is a new oil developed for cars with higher mileage outside of factory warranties. It has a much higher zinc and phosphorus content, the two main antiwear metals in oil. That is why it is not SAE approved, because it exceeds their allowances for those two metals. The reason the SAE won't approve more is because it can damage catalytic converters, thus the oil is designed for cars outside of warranty (a non SAE approved oil will void your warranty, should anything go wrong). The standard Royal Purple is the same as it was...

http://www.bobistheoilguy.com/forums...Number=2319761

RP has changed their lineup.

The normal RP sold at Advance Auto and other places is the new AP SN formula that does not contain any Synerlec because it cannot be used and meet SN standards. They are in switchover right now, so you can tell the difference by the bottle style as the new SN has the new bottle design (as does the new HPS below)

They have added a new oil the High Performance Street (HPS) that still contains Synerlec and higher levels of ZDDP (around 1200 ppm). This oil has been reformulated with more Synerlec than the previous "normal" RP (I got this from the RP tech line). In addition the under 40 weight oils had the ZDDP increased to the 1200 ppm ZDDP rather than the 1000 ppm previously used to meet the SL standards. The 40 and 50 weight oils previously and still have 1200 ppm ZDDP

The XPR (extreme performance racing) line is unchanged as far as I know.