From the Owner's manual, page 292:
"Engine Oil Capacity | 2.5 Liter | 5.5 quarts (5.2 liters) (with filter change)"
As for the Roush test/recommendations:
There has been much discussion of late as to whether the thrown rod issue is an oil starvation issue, or a harmonic damper issue. I lean toward the damper school of thought, but honestly there's no way I'm qualified to figure this out on my own. (IOW, I doubt we could have an intelligent argument on the subject, and I would be at your mercy.
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