2001 Toyota Sienna 3.0 V6, 3,482mi, Valvoline Synpower 5W30 engine has 101,242 miles: You added just 4oz of Marvel's Mystery Oil additive to this 5W/30 and there was some improvement in copper from brass/bronze parts. All of the wear metals read right around the universal averages for the Toyota 3.0L V6, which is encouraging. The TBN was 2.0 showing some active additive left in the oil. When it reads 1.0 that active additive is almost gone. 0.5% of the sample was gasoline, likely from city driving and it didn't cause any problems. Air and oil filtration were normal. No moisture or anti-freeze were present in the sample. Check back in ~3500 miles. Aluminum 2 Iron 5 Copper 4 Lead 2 Tin 1 Moly 21 Potassium 2 Boron 11 Silicon 13 Sodium 21 Calcium 2475 Magnesium 11 Phosphorus 734 Zinc 877 SUS [email protected] - 56.0 cSt [email protected] - 9.07 Flashpoint F - 355 Fuel 0.5 Insolubles 0.3 TBN 2.0 I haven't seen many Valvoline Synpower posts. This engine is known for being hard on the oil, but I was surprised with a TBN of just 2.0 after on 3,400 miles. What's the verdict ladies & gents? PS: I've switched to Pennzoil Platinum for the next change.