I've recently switched to Redline 5W30 after running Mobil 1 5W30 in my turbo engine (WRX) for 15,000 miles,. The initial results were good—higher oil pressure, quicker turbo spool-up, a little raspier exhaust note. But after seeing some of the screwy UOA results for Redline—higher wear numbers and quickly depleting TBN as compared to the Mobil, I thought geez-- maybe I'd better switch back. Now, after doing some further reading, people have expressed the opinion that: 1) The high wear numbers are from Redline additives cleaning up the varnish and sludge left over from previous motor oils. 2) Sure, the TBN numbers are low, but the superior base stock of the Redline acts as a detergent in itself, so the low TBN is nothing to worry about—the oil is still doing it’s job. 3) Redline is formulated different than any other oil, so don’t worry about the UOA numbers when they look out of line. For example, it already comes with a lot of silicon as an additive, so don’t worry about the high Si readings. Ok, so now I have to ask, what’s the definitive answer here? Is Redline really a superior product that gets a bum rap from having to clean up the mess left over from previous oils? Or are Redline supporters (and must admit I like the stuff myself) making excuses for an oil that looks great on paper, but isn't that good when objectively analyzed? Also, doesn't higher oil pressure create more engine wear? Maybe that's why Mobil keeps theirs low. Finally, why would Redline even use Si as an additive, anyway? Isn’t silicon an abrasive substance that air filters are supposed to keep out of our engines to prevent excessive wear?!!