carwale.com is the first link on msn.com search for 'car purchase india' and second link on 'Car sale india'
http://search.msn.com/results.aspx?q=car+purchase+india&FORM=QBRE
http://search.msn.com/results.aspx?q=car+sale+india&FORM=QBRE
Carwale.com also appears prominently on search of maruti or tata models.