The key index closed at record highs for the third straight session.
However, the broader NSE Nifty slipped from its lifetime high to close at 10,323.05, down 20.75 points, or 0.20 per cent.
For the week, the Sensex recorded handsome gains of 767.26 points, or 2.37 per cent -- its best weekly gain since January 27.
The Nifty rose 176.50 points, or 1.74 per cent, during the week.