The 8% on the CCS is so small it is not even funny here. The temps for these ratings are different but look at the pumping temp and pour here. CCS is cold crank simulator it show the oil flows during a certain time interval and certain temp rise (I think 5 degrees C). The CCS is intergral to SAE J300 I think. I can look up these spec in the am if need be., I think, again, think the viscosity maximums are about 1.6 to 1.8 times the old values.
Yes, these values are for un-used oils here. Yes, 2 engines could have different values but they should not be a huge delta here since these cars have good quality control (aka SPC). If they are way different it is not engine related here.
Both oils are good but for the short drains you are doing I do not think you are going to see anything jumping out on an oil tests to say, “wow the series 2000” is great. I personally think they (series 2000 and 3000) are overpriced for what you get. But that is me.
Oh, there short drains for Amsoil diesel oils are going to be 25K or 1-year starting in 2006 because or there new filters. Now that is impressive for a wiesel. There new bike oil is also gone the extra mile here. Again, I like there oils, but do not trust there little fancy books nor half on what dealers say since most times they are incorrect.