So I changed the oil on the Buick in my sig today, out went Quaker State Defy 10w30 and in went Mobil Super High Mileage Synthetic Blend 10w30. The Fram Tough Guard from the last oil change stayed on for an additional OCI. The previous owner changed the oil anywhere from 5-10K miles from the looks of the paperwork in the glove box (family member), so I gave it a short initial OCI to "flush" it out a bit. I left the QSD in for 3 months per the owners manual, this will stay in for 3 months / 3000 miles as well per the owners manual. Just curious what your thoughts are on this oil? I could not find a single UOA/VOA on this stuff, and it doesn't seem to have a large following either, not a whole lot about it here on BITOG.