How good is this oil? (S-Oil Seven Gold C3 5w-30)

S Oil makes very good Group 3 called "Pure Base". Kendall and Motorcraft use S Oil through Phillip 66.
 
S Oil makes very good Group 3 called "Pure Base". Kendall and Motorcraft use S Oil through Phillip 66.
Is that an Excel Paralubes product? When Pennzoil was a partner with Conoco-Phillips in that venture, they marketed product as using Pure Base.
 
S Oil makes very good Group 3 called "Pure Base". Kendall and Motorcraft use S Oil through Phillip 66.
Is it 'Pure Base' or Yubase? I thought that Motorcraft FS and Syn-blend used South Korean sourced 'Yubase'.....but I could be wrong. If S-Oil makes Yubase I would think this is a very good product.
 
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