Yeah I was definitely going through some oil before. At the worst point I was probably adding almost 2 qts over the period of one oil change. You could also 'smell' the oil in the exhaust fumes (catless). Initially I only put one of these on the car and while some consumption went down (at most about 1 qt per change) it didn't really help too much. Back in December I put on the other one and it made an immediate difference in the exhaust smell (why am I smelling my exhaust, you ask?). It's weird though because I still burned a little oil then too but it seems that since I replaced the oil then and changed it over two weeks ago the consumption has been negligible. Nothing else has really changed so I would have to say these things worked.