Bitog member wemay recently asked a question comparing Motorcraft and Castrol motor oils. I was going to respond and point out that Motorcraft has the moly/boron combination, and Castrol shows very little of these, but plenty of sodium. However, it looks like Castrol is bouncing around a bit on additives. Here we see Castrol 5w-30 SN GF-5 tested by PQIA. This was the VOA that I based my opinion on. However, Here we see Castrol GTX 5w-20 SN GF-5 with 80 ppm Boron and no Sodium. Seems like quite a shift in add pack chemistry. Other PCMO's, such as PYB and VWB seem to be more consistent in their philosophy. I know that some here prefer a non-sodium add pack, and until I looked at that most recent GTX 5w-20, I would have said to avoid Castrol if you're of that opinion. Now, who knows?