Originally Posted By: y_p_w
Originally Posted By: supercity
I remember many years ago buying Pennzoil 5w50. I also used Elf 5w50. There is also Penrite 0w50 if you can get that. These days however I would not look any further than Mobil 1 5w50.
Not available in the US. For the longest time, the one 5W-50 that was commonly sold in the US was Castrol Syntec around the 1990s. Not sure how equivalent it was to their oil sold elsewhere in the world. Apparently they still have a 5W-50 for sale in the US.
Yes, Castrol does have a 5W-50, II've got some in the garage right now. It's their "classic car formula" and has a boat load of zinc for flat tappet engines. I use it in my ATVs, but I wouldn't use it for this application.
All of the recommendations being made here are great oils, but that doesn't change the fact that they don't meet Ford's spec. The only two oils that meet spec are Motorcraft 5W-50 and QSUD 5W-50. I wouldn't use anything but one of those two while under warranty.