Bests & Worsts Reviews from Amazon

PLEASE READ ALL OF THIS REVIEW, as I have made several changes. While I can't say that "power" has increased any noticeable amount, (one to ten horsepower is really not noticeable) it does in fact sound better. It also starts smoother. Running this in my 99 Saab 9-3 is certainly doing it a service, at 126,000 miles. Nothing but good things to say about it. Yes, it's more expensive. But you only have to change it half as often, which makes the whole thing level out on price anyways. Don't forget to get the royal purple oil filter, too. It's worth it. UPDATE Running past the 7000 mile mark on the Royal Purple. Still holding strong. I believe it is recommended to change the oil filter after 6000 miles. Will do that relatively soon.. Maybe. The royal purple oil filters are great. Maybe just a cheap Walmart filter for the remaining 3000 miles id put on it. They say you can go 15,000 miles, but I'm not going to push it. 10,000 for me. Update! Just changed my oil at the 10,000 mark. I will be sending a sample of this oil in to get analyzed. It's worth noting that I am hard on my motor. I race, I drive through steep mountains, and my car is turbocharged. When I receive the results from the analysis I will post a picture here for all to see. But overall, I'm impressed with this oil. I've never had to add extra oil within the 10000 mile interval I chose (other than the time I replaced the filter. that took close to a quart to make up) I replaced this oil with the Royal Purple HPS oil, as I am led to believe the HPS formula is superior, even though I just hit 137,000 miles. We will see. Stay tuned. The HMX results are in! 2-5-16 A little discussion about this. The oil was certainly run very hard. Lots of town driving, and WOT pulls. The engine is turbocharged, so consider that. The Lead levels are way too high. The flashpoint is far too low. Sodium high for no apparent reason. Read the analysis for your own thoughts. This oil, at 10,000 miles, is just not up to par. It is supposed to be good for 15,000 miles, but for hot-running turbocharged motors, I would not recommend this oil any longer than 7,500 miles. Update! A lengthy email to Royal Purple about my disappointing analysis has revealed some new information. He (the gentleman I was emailing) has confirmed that yes, my lead levels are higher than normal for the extended interval. But only slightly. He explained to me the source of the sodium (he said that he suspects I added one replacement quart of the regular RP oil rather than an hmx blend, which may be possible.), and how my 1.5% concentration of fuel is certainly to blame for the low flash point. He then went on to say that typically, your motor should be run on at least two regular-length intervals on Royal purple, before attempting extended miles. This is because of two things, 1: to remove all of the old oil effectively. 2: to prevent filter clogs, as RP oils have an agressive cleaning property. I did not do the two short (5000) mile intervals before going for 10 or 15k. As suggested by Blackstone labs, I will be sending in a sample at 5000 miles. (3.5k away as of 2-24-16) I shall be updating soon. Stay tuned! Meanwhile, I have bumped their rating back to 4 stars for their excellent customer service. I had a good long email session with him, and he was professional. A pro, if I may. After I was satisfied with his answers about my oil, I asked about my transmission fluid. Then he went and researched all of the specifics on my transmission. Everything from model number, to the capacities. 3.6 qt in the pan, 7.4 total.