I applied through college or university. The process took 1 day. I interviewed at Indian Oil (Amritsar) in Jun 2012
Interview
Campus placement. Shortlisted as was one of campus toppers. 10 Mins F2F interview with panel. Mostly questioned about how would cope up with diversity in organisation. Overall was quite good experience. Lasted for 10 minutes.
I applied online. I interviewed at Indian Oil (Neu-Delhi) in Dec 2015
Interview
Cordial board asking from your CV only. They asked a lot of questions from your background and how that can be helpful to IOCL. Also asked about basic management concepts. Some questions were about IOCL and its operations and brands. Overall board was very cordial and tried to make you comfortable from starting. Only advice is to work on your basics thoroughly.
I applied online. The process took 3 days. I interviewed at Indian Oil (Farīdābād, Haryana) in May 2014
Interview
Technical Interview followed by Panel, Group Discussion, Technical Interview with Higher management and finally HR Interview
First there was an written test where technical questions were asked. after cracking the test there was an group discussion followed by technical interview with Higher management.
In this technical interview Miscellaneous questions from other engineering field were asked