Blackstone sez: We did notice a slight increase in iron with this sample. You mentioned that you're running the engine hard, and a little extra iron can be a normal side effect of hard use. Other metals look great and this isn't enough iron to really worry about, so we're not too terribly concerned. There was a trace of fuel in this sample, but that's probably operational in nature and fuel isn't a major concern until it reads 2.0% of the sample or higher. The TBN read strong at 5.1 and the TAN was 6.3. Both readings are a little higher than normal, but still fine as far as we can see. My thoughts: The M1 0w40 seems to work well for this car, and could've gone much further than 6,000 miles. The iron is slightly elevated but everything else is fine so I agree that it's probably nothing. Considering how I drive the car to redline often coupled with the short-trip nature of my driving, and how high-strung the engine is to begin with, the numbers look good. Fuel was probably elevated since I didn't drive it very far to get the oil change that morning and it was probably running a tad rich. The car has a very aggressive cold idle to help warm the pre-cats. The only reason I changed it was because the CBS indicated I needed a change (it thought this was still the original TWS with 13,674 mi on it). I have opted to do "intermediate" changes at the halfway point between BMW's recommended 15k intervals. At this rate, I will probably change it again in the late winter.
OIL M1 0w40 Castrol Edge Pro TWS 10w60 MILES IN USE 5,920 7,754 MILES 57,028 51,108 SAMPLE TAKEN 07/14/14 12/13/13 ALUMINUM 5 4 CHROMIUM 0 0 IRON 11 8 COPPER 2 3 LEAD 1 0 TIN 0 0 MOLYBDENUM 64 48 NICKEL 0 0 MANGANESE 0 1 SILVER 0 0 TITANIUM 3 10 POTASSIUM 4 3 BORON 112 27 SILICON 6 4 SODIUM 5 5 CALCIUM 2648 2395 MAGNESIUM 32 57 PHOSPHORUS 806 796 ZINC 917 843 BARIUM 0 0 INSOLUBLES TR 0.2 WATER 0 0 FLASHPOINT ºF 375 425 SUS VIS 210ºF 70.9 83.5 cSt @ 212ºF 13.19 16.40 FUEL TR <0.5 TBN 5.1 3.4 TAN 6.3 3.4