Originally Posted By: OVERKILL
Originally Posted By: A_Harman
Originally Posted By: swirlparanoid
Originally Posted By: michaelluscher
Mobil, Castrol, Motorcraft, and you found Redline.
Maybe amsoil has something for you?
That's all the oils available in the specced visc.
I would use the Motorcraft but i read somewhere that it shears pretty badly.
Figures that they would recommend something with such little competition so people buy the Motorcraft. Looks like ill have to go with Redline or Amsoil then.
Redline or AMSoil would be good choices. Did you study the spreadsheet on the link that DragRace posted? There is a lot of good data there. It shows that MC 5w50 always shears to a 40-weight, and sometimes to 30. It shears an average of 32%. There are a couple of UOA's there that show it shearing >40%. AMSoil looks to be the least shear-prone on the SVT spreadsheet. Their 10w40 starts out a 40 and stays a 40. Redline 5w50 shears about 15%, but does stay in the 50-weight grade. Motul 300V 10w40 only sheared 2%. If you plan to run your car hard, I would definitely stay away from MC 5w50.
I'm sure this is based on extensive tear-down testing like Ford has done and not just UOA's right?
If you have teardown data from Ford documenting how MC 5w50 is better than AMSoil and Redline, post it. As it is, I think that the SVT data is the best information that has been brought into this discussion.