This newest reading is on oil in the car for 189 miles. I was confirming my Mobil 1 0w40 SN that I took in was used and I find the near virgin oil fascinating. The previous two columns were SM Mobil 1 0w40, and the oldest two columns were Mobil 1 5w40 (a special dealer product). This new fill of SN looks fine and richer in Boron and Calcium than the near virgin fill last year. However....Why do I have silicon at 7 after an oil change and sodium at 4? This is like 3/4 of the amount before the oil change I guess down to 4 Iron would be normal though? 1/2 the aluminum sticks around too. I wonder...my dealer likely sucks out oil. How clean is it when they do this? I guess I'm being picky, but it makes the end of year numbers more impressive when you see you start out with some of these numbers already a god bit higher than 0. I know there is residual, but some of it seems higher than you'd expect? I really think we should consider this when we look at people's UOAs, if after only 189 miles, a good chunk of the final contaminants were already in the oil. I didn't bother with TBN on this fresh oil since someone already has a SN VOA of 0w40.