Average Reviews:
(More customer reviews)Royal Purple is a excellent synthetic oil. I now use this oil in all of my vehicles (with differing weights)
I have an 2008 F150 that has the notorious hot idle Cam Phaser tick. I tried many oils/weights to try to get rid of this, but finally tried RP 10w40 and it has silenced my cam phasers (the thinner weights of RP reduced it, but did not get rid of it).
In my other vehicles, I use 5W20 (winter) or 10w30 (summer) and it has made each one run very quietly and smoothly. I even think I may be getting better fuel economy.
While all synthetics are good, what sets RP apart form the others is it's Synerlec additive. This additive is a very tenacious, slippery additive that reduces friction and almost significantly reduces wear. If you look on YouTube at the Timken machine tests with RP, you can see demonstration of just how good this additive is. While the Timken machine is not the end all, be all, test for oils, it does demonstrate just how good RP is in extreme pressure situations when the oil film is cut through due to engine stress.
With a great additive pack and real Group IV (PAE) base oil (most synthetics today use a cheaper Group III base oil with only a few exceptions) this oil protects extremely well and keeps your engine very clean - not to mention with it's 12 Total Base Number (TBN), it has enough acid neutralizers to be a long drain oil up to 10k miles (my maximum), although others have pushed much further.
If you decide to try, make sure to follow the instructions and do two short Oil Change Intervals (OCIs) of about 3000 miles before extending the OCIs - this will let RP clean up your motor and get it's Synerlec well imbedded into the metal surfaces of your engine. After the two short OCIs, you can push the OCI to whatever limit you are comfortable with. Some comments on here have suggested the quietness has gone away after a few thousand miles - and that is because they did not start with the two short OCIs - with this approach engines remain quiet for any length OCI.
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