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(I copied this over from my 5w30 review because I talk about both products here)
A lot of reviews here talk about the product itself, and I think they have hammered the point that RP is one of the best synthetics that you can buy, up there with oils like Redline. I purchased my '10 RX8 in May 2010 with 16 miles on the clock and have been babying her ever since. After a few goes at conventional oil to break in the engine, I switched over to the RP after some great suggestions by the rx8 community. In doing so I took care to be very meticulous about my oil changes, performing them every 3000 miles, and saving samples to send to Blackstone labs just to make sure that the oil was doing a good job and that my engine was healthy. I ran the RP 5w30 in the winter, and then ran their 10w40 in the summer and had absolutely no problems. Once I changed out my first interval of the 10w40, I sent the samples over to BSL (~$40 total to sample both) to check the results. Although the numbers were above average, the Viscosity numbers were a tad low .... not alarmingly low, but I expected them to be stable considering that this is a premium oil. The guys over at BSL assured me that this was completely normal, and because my car only has 10k miles on it now, it could just be residuals from breakin/conventional oil use/some 5w30 that stayed in the sump when i put the 10w40. In any case, I sent my reports over to the folks at RP just to have them take a look-see. Within a few hours I got back a reply from the RP team pretty much confirming what the guys over at BSL said. Along with that, they stated that they wanted to continue monitoring my use just to be 100% sure that their assumptions are correct. They sent me free sample kits and told me to send them some samples when I do an oil change again.
There aren't that many companies out there that A. produce a fantastic product, B. advertise without bogus claims, and most importantly C. stand by their product 100%. If anything, this company got my respect and loyalty due to their immediate response and their handling of my concerns. Now again, let me stress, my oil analysis numbers were fantastic and were exactly what was expected of a newer car...but just because I had concerns the folks at RP asked me to send them over more samples so they can run an analysis free of charge.
I hope that helps most of you that are still on the fence about trying this product even though it has a fantastic quality reputation. Hopefully this will convince you that the team also has great relations with their customers.
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If you are buying this oil because of the wear tests, then beware. The Royal Purple oil used in the wear tests has Synerlec, and this oil (High Performance) does not have Synerlec. If you want Synerlec, you must buy Royal Purple HPS (High Performance Street) or XPR (Extreme Performance Racing).Best Deals for Royal Purple 01140 API-Licensed SAE 10W-40 High Performance
Buying a case is the way to go! I use this stuff in my 98 BMW M3 and quiets the lifter tick nicely. These engines are notorious for having a ton of mechanical noise and the RP helps a lot in reducing this. I run 10w-40 year long and have no problems. It may be a tiny bit thin when warm but the wear protection it gives is great.Honest reviews on Royal Purple 01140 API-Licensed SAE 10W-40 High Performance
I got this oil and a royle purple oil filter changed in my 1995 Saab 900s at pep boys the only mechanics who carry both, and wow from the start of my car and the ride home was amazing smoother shifting and just glides so much better with a quieter running engine, will definitely use from now on....this product came highly recommended....your car is only as good as the products you use. thinking of changing out my manual transmission with the rp gear oil. :-)Find helpful customer reviews and review ratings for Royal Purple 01140 API-Licensed SAE 10W-40 High Performance
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.
