This whole oil thing is quite confusing. I understand (at least roughly) that the higher the group# the higher the quality of the oil (at least to a degree). Now my question is this, I like to use a syn blend in my Nissan 4x4 beacuse of short trips and small sump. I have used the Mobil DC Plus Blend and Syntec Blend, and am contemplating using Motorcraft 5w-30 since it seems to be a blend. The Mobil is supposedly a Group 1 base oil with PAO, the Syntec is Group 2 with Group 3, the Motorcraft is still a mystery to me; which is better in terms of absoute protection AND also for bang for the buck? This was much simpler back when I thought that Castrol was the best dino and was the end-all be-all of oils.