How to change content of data in linux

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Linux

shellscript

Hi People,

I want to change the content of the data using shell script.
The script run and will change all the 530, I just want to change only 530, not INP50101530

INQ|530|INP50103245|0|01/10/2014|0|E7PW44TU7|TODRT|INP50101530|A|DTA|17/10/2014|OGF|IN410501A|23/01/2014|24/01/2014|1|R|F|530|IND1WPG|N|40|3|1009|N|A|136800|136800|11340|526.154|65.769231|INR|INP00804|23/01/2014|23/01/2014||22/01/2014|23/01/2014||||N|1| |IN|OP|23/01/2014|MBI|210|TRD|Finish Line|I


the script;

grep -rl '530' /home/daimler_dubai/aqilah/daimler/*txt | xargs sed -i 's/530/MBP/g'

Thanks in advance