I used to only run Castrol Edge or Mobil 1 in both my 5.2 and 3.0T. the 3.0T didn't seem to care what it ran, but the 5.2 would burn off both of those at a rate of roughly 1200 miles per quart. After having to do a yearly(25k mile) intake pull to clean the valves/intake, I switched to Liqui moly Leichtlauf for the 5.2 and Molygen for the 3.0T. 5w40 regardless of which oil or engine.
as before, the 3.0T doesn't seem to care other than a slightly reduced amount of magnetic schmoo on the magnetic drain plug. So, better, but not a significant difference.
The 5.2 has pushed the oil consumption into the 2000 mile per quart range, the valves only had maybe 1/3 of the buildup as before and I'm no longer pushing small amounts of oil into the spark plug wells. So, undeniably better for me. Magnetic drain plug looks better here as well too.
