Okay, everyone knows that I like to buck convention. If you say that 5 is too many ...I'll pile on 83 just to make sure that I've covered all the bases in variance in an attempt to find out the truth. The results aren't always all that enlightening ..at least beyond "what didn't happen" (the earth didn't stop rotating, atmospheric conditions stayed the same, the fed didn't alter interest rates, etc.) eyesgotz2nose. In that spirit, I've just drawn a sample from my wife's 4.0 TJ that is 2000 miles into a rinse phase of a one shot Auto-Rx cleaning with MC 5w-20. This is just to verify that nothing too radical is going on ..but is also to check on air filtration before I do an "in engine" VOA (a couple of heating cycles) and a 5k run on MC 5w-20 (the oil is in there now ..and will be for the next tests). I've been using a cylindrical K&N filter that I typically serviced biannually. Most commented that I was servicing it too often, so I let it go. My Si and Na numbers were pretty good ..but I wanted to see if leaving it unserviced longer was the right thing to do. So, what do you think this will show? I have a high volume oil pump and this is the only visc that has managed to actually "fit" into the engine after startup. 30 and 40 weights are up against the relief off idle (58lb) even when fully warm. Now I'm at 51+/- on the highway ..and anywhere between 22 and 32 at idle. I expect: extremely low Pb (if any) elevated Fe (how much, I don't know ) and other elements based on how good the air filtration was. What's your guess? The best UOA ever? Pending doom for the valve train? Mediocre results with enough stuff to nitpick to keep everyone busy for a day or two ..maybe a two page topic? Place your bets. The contestant with the most accurate guessimate will be awarded the highly covetted Gary Allan for being a true prognosticator of distinction (that and $2+ will get you a cup of coffee at Starbucks). Barbra Streisand will sing for you.