The test data in the second article is from 1995 and 1999. Also Castrol was actually synthetic for the tests, not as it is now. That data has no relevance to someone deciding what to put in their car today.

99 Silver CSVT #1081/2760 97 Nissan Altima 83 Corolla SR5 RWD bondo/rust body 'ghetto cruiser' RIP 78 Winnebago Minnie (Dodge Chassis 23') 440cid 4bbl.