UOA 2004 Prius 10K oci, Mobil 1 0w20 SM, GF4

[attachmentid=7415]I recently received a used oil analysis (UOA) report from Blackstone labs. The oil has 10010 miles on it and the car about 60K, the oil was analyzed at 2.5K, 5K, 7.5K, and 10K. No oil filter changes, nothing added to oil except Mobil 1 0w20 and nothing added to the gasoline. About 3/8 quart added to replace the 4 oz removed for the first 3 analyses. Another 3/8 quart added because I started the oil level at about halfway between the full and add marks on the dipsticks. It turns out that this is about 3/4 quart below full (I had originally thought it was 1/2 quart) and I wanted the level to be closer to full. Why? For an extended oil change interval(oci), more oil will allow a longer change interval. Most of the makeup oil (5/8 quart) was added just after my 7.5K oil sample when someone over at Bobistheoilguy(bitog) pointed out the relationship between oil capacity and oci. Note the lack of fuel dilution, for the most part the oil looks good so far, I hope to take it to 20K (it remains in service.) Data is below, comments welcome.

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Blackstone Labs Oil Analyses for 2004 Prius         
oil filter Mobil 1, air filter is OEM, oil  in service 9/26/06 at 50455 mi
Oil Type    Mobil 1 0W20 SM                
Date     04/07    02/07    12/06    11/06    _____    02/11/07
makeup    0.625    0.125    0____    0        
Eng mi    60465    57983    55358    52834    Univ_    VOA
Oil Mi    10010    7528_    4903_    2379_    6400_    0
Al_____    4____    4____    3____    2____    3____    0
Cr_____    0____    0____    0____    0____    0____    0
Fe_____    9____    8____    5____    1____    8____    1
Cu_____    1____    1____    1____    0____    1____    0
Pb_____    0____    0____    0____    0____    0____    0
Sn_____    1____    0____    0____    0____    0____    0
Mo_____    94___    88___    94___    91___    63___    93
Ni_____    0____    0____    0____    0____    0____    0
Mn_____    0____    0____    0____    0____    0____    0
Ag_____    0____    0____    0____    0____    0____    0
Ti_____    0____    0____    0____    0____    0____    0
K______    1____    1____    0____    0____    1____    1
B______    42___    40___    47___    51___    62___    74
Si_____    11___    11___    12___    12___    15___    3
Na_____    6____    3____    5____    4____    8____    4
Ca_____    2234_    2210_    2273_    2220_    2423_    2080
Mg_____    13___    12___    11___    11___    34___    13
P______    636__    599__    631__    613__    637__    770
Zn_____    774__    700__    739__    720__    734__    871
Ba_____    0____    0____    0____    0____    0____    0
Visc___    52___    51.5_    53.9_    52.2_    53-59    54
Flash__    400__    370__    365__    370__    >355_    440
Fuel___    <0.5%    <0.5%    <0.5%    <0.5%    <2.0%    
Antifr_    0.0%_    0.0%_    0.0%_    0.0%_    0.0%_    
H20____    0.0%_    0.0%_    0.0%_    0.0%_    <0.1%    
Insol__    0.3%_    0.2%_    0.4%_    0.2%_    <0.6%    
TBN____    4.4__    4.6__    2.9__    8.6__    _____    9.9
TBN of 2.9 was probably in error, 4.6 result rechecked twice (4.5, 4.7)
1/8 quart (4 oz ) Mobil 1 0W20 added 1/11/2006        
5/8 quart (20 oz) Mobil 1 0W20 added mid Feb 2007    

xcel file is attached (more readable for those with MS Office)