No, they did not fix the problem, based on my experience. 2011 Outback blew a head gasket at 112,000 in Dec 2016. Just blew another head gasket at 150,000, about 20 months later. I think I bought my last Suby.
No they have not. Subarus may be great cars, but just plan on a head gasket at about 150k, like clock work. Just last week I had to pick up a cylinder I had machined at the local machine shop. I looked at one of their work tables and there were about 6 pair of Subaru heads. All being rebuilt at the same time.
so subaru hasn't fixed anything regarding head gaskets for normally aspirated EJ's. you will get some weeping at 60k, wet heads at 90-100k, then at 110k+ just pray. more than likely its just the external oil leak until 125k-150k or so, then its a good time to do it. just monitor coolant and oil and you should be fine.
The problem started when Subaru started using a composite head gasket in some of their car models from 1997 to 1999. The device features a multi-layer steel shim coated with a graphite layer. It was not up-to-the-mark and allowed coolant leak into the exhaust pressure and combustion chamber. There...