Run synthetic with low OCI's, and keep your banjo bolt filter (check and replace the part if you do not a full oil service history on this vehicle)....for street use, do not use any synthetic with higher viscosity than 5W30....Mobil 1 sells a European formula 0W40 that works great in these motors and sells off the shelf in Super Walmarts....the part number for the banjo bolt/filter combination is identified in this forum....but if you can't find it with a google search, pm me with your VIN and I will run it through Subaru FAST (the parts database)...
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