This is for my Forester. I used a prepaid Wix analysis kit.
Original fill:
5.0 quarts Pennzoil Platinum 0w-20
0.5 quarts Castrol Edge 0w-30 GC
Added at 5,000 miles into the OCI:
1.0 quarts Castrol Edge 0w-30 GC
I drive with frequent WOT. My commute is 23 miles of back country roads. Here is a good UOA for comparison.
Html:
Oil PP 0W-20 & GC 0w-30 Miles on Oil 7,400 Miles on Car 22,400 Filter Wix 57830 Sample Date 7/7/14 Make Up Oil 1.0 Qt. Aluminum 7 Chromium 0 Iron 11 Copper 4 Lead 0 Tin 0 Molybdenum 58 Nickel 0 Manganese 0 Silver 0 Titanium 0 Potassium 6 Boron 6 Silicon 13 Sodium 7 Calcium 2227 Magnesium 177 Phosphorus 753 Zinc 905 Barium 0 cSt Viscosity @ 100°C 9.0 Water % 0 TBN 5.0