Hi all, thanks for reading. I have a head gasket leak in my Legacy Outback Limited (I believe a 2.4) and I decided to fix it myself. I've looked for videos online and have not found anything all that useful. If you can help me out or know a video that can do the same it would be greatly appreciated. I'm almost at 200k so I'm thinking I'll do the timing belt while I'm in there (I have heard that I'll be in a good position to replace the timing belt during this job). The gasket is not blown or cracked (I think). There is oil collecting in the coolant overflow tank. I just replaced the O2 Sensor and after a month started getting the code for that again. A person I talked to that has done a bit of work on Subarus told me that the problem there could be the catalytic converter and that could be caused by a head gasket problem. He told me to check the coolant overflow and if there is oil in it that would point to a head gasket leak. He also said that it is a relatively easy job but is not available to ask for help as he is someone that don't actually know but just met by chance and got some quick advice. This also does make his advice questionable as I'm not 100% sure if he knows what he is talking about (although he seemed very knowledgeable on the subject). I do have a friend helping but he has only done this on other cars and not a Subaru. Any help I coluld get would be amazing, thank you!