Dirty oil pooling affecting head gasket life.
I had not considered that.
I found it interesting that Subaru changed the oil change interval.
My '14 Forester required 7500 mile changes.
My '17 and '18 Foresters required 6000 mile changes.
The same 0-20 fuel economy full synthetic oil is specified.
Could the cleaner oil help the head gaskets live longer?
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