Here's my first sample on my Rondo, turned out to be a snoozer. Some history, I have owned the vehicle since new and I have run every oil fill almost exactly 3000 miles including the factory fill. 2007 Kia Rondo 2.4 liter 4cyl 21000 miles at time of sample 3000 miles on sample (warranty compliance - severe service) Mobil Clean 5000 OEM filter Sample done via dipstick hole after a 15ish mile freeway drive in 85 degree weather. Oil was changed later that evening. Lab: Holt Cat, San Antonio, TX Wear Metals/Additives Cu 1 Fe 4 Cr 0 Al 2 Pb 0 Sn 0 Si 9 Na 253 K 2 B 56 Mo 109 Ca 1571 Mg 13 Zn 672 P 551 Oil Condition ST 0 OXI 17 NIT 10 SUL 22 W N A N F N V100 9.4 Lab comments: Normal wear metal readings. Sodium is high. No glycol detected at this time. Inspect oil filter(s) for any evidence of larger visible debris trapped in the filter element(s). Check for any unusual performance, noises, vibrations, oil pressure, fluid levels, etc. Continue to monitor. Change the oil and filter(s) if not already done. Resample at half the normal interval. Well obviously I'm not going to do any of that! MC 5000 contains sodium as an additive. I am very pleased with this report, I live 2.2 miles from work and I do many, many 5 minute trips in this vehicles. I come home almost every day for lunch so my day consists of 8.8 miles in 4 short trips. I thought that the wear metals would be higher and the viscosity would be solidly down into the 20wt range. Not so. I think maybe I'm going to go cheaper - the OEM filters are about $6 each and MC5000 costs about $2.60 a quart. 3000 mile changes are needed for warranty compliance according to the dealer. I'm going to look for one of those 5qt oil change specials with 5 quarts and filter for around $10. Although this time I got QS HP full-syn on sale for $8 after rebate, so that's what I'm running right now :D. I got 2 more jugs of it too which should take me through to the 30K service at my current OCI's. Also running a Wix filter which is a funny story. Found an old Wix in my garage for a vehicle I no longer own. I took it out and was eyeballing it and then I realized the receipt was still in the box!! From 10/04 lol. So I took it back and O'Reilly's took it back after some discussion amongst employees. Picked me up a 51334 and I'm using it with the current run of QS HP 5w30. Another thing I'm thinking about trying on this car is 5w20, it is printed right on the oil cap to use GF-3 5w20. But the manual says that 5w20 and 5w30 are ok in all temps and 10w30 is ok above 0F. So I'd like to try the 5w20 and see if it gives me any extra fuel economy. With the large amount of short trips that I do, I doubt the oil ever gets anywhere close to 100C anyways. I did use the 5w20 for the first couple of OCI's but since then I've run 5w30 for no particular reason other than my comfort level. Comments welcomed...although not really much to say about this one.