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Hot oil is good, but a better sample will come from a pressurized (turbulent) oil flow. I don't think the dipstick would help with a sample, although I agree there is a certain comfort in being able to measure the oil level physically. On heavy equipment, we installed permanent sampling ports on all machines we sold so that we could do quick samples. The sampling ports are very cheap, and easy to use.
Since the oil lasted so well for the 14,000 miles, it would be good to know what it was. Do you have service records, and know if the last oil change was done at the dealer? Based on the mileage and age, it seems that it might have been under the prepaid maintenance program, meaning bulk BMW 5w-30 oil (Castrol, not GC)
I wouldn't worry about the metals too much given how low the insolubles are. That reading indicates you don't have high levels of wear material in the oil, which is what counts.
Do you have low compression or excessive oil consumption?
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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