I applied through college or university. The process took 2 weeks. I interviewed at Lubrizol
Interview
I spoke to them at the co-op fair at my university. Shortly after I received a phone call asking me to come back and do an interview while they were still on campus. That interview went well and they asked me to go on-site for a second interview which last ~8 hours and consisted of many individual interview sessions with various employees and a short tour of the site.
Interview questions [1]
Question 1
Mostly behavioral questions and questions about projects/experiences on my resume
I was interviewed in person by a panal of 3 people. They ask tough questions so be fully prepared to know everything about the company and make sure to practice your answers.
I applied through college or university. The process took 4 weeks. I interviewed at Lubrizol
Interview
I applied thru school's internship database. The whole process took about a month, including a screening phone interview and if you are selected, they have another interview with 2 or 3 other engineers. The interview was relatively easy. For interns, they mainly asked behavioral questions.