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a very long time ago, I recall hearing of a test done with NYC taxicabs. They actually tore down some engines and measured wear. They let some go without oil or filter changes for a very long time. Just topped-off. (sry, don't recall specifics) - pretty much, if thye had oil in them they were fine. (not really an apples to apples comparison I guess as they idle a lot and are parked indoors.....still....?) I have run 5w-40 primarily because, a car can sit around in a parking lot for 8 hours in august here. Underhood temps can get quite high. I just felt that I didn't want some thin oil running out of the bearing surfaces . 'They' say there is significant wear at the moment of starting a car because you have zero oil pressure for an instant.

Those H6's are the most recommended Subaru I've helped a lot of people buy/repair, many first time Subaru owners I know I helped them into an H6.. since all the Ej22's rusted out many years ago around here.

Many of the older models didn't have them. Only higher end models usually. Forester for example - early L models were not equipped while the S model was. You will likely need mounts and end links. GD