Rotella: -15 Pour Point, 415 Flash Point, 3.7 HT/HS, 10.0 TBN
Delvac: -27 Pour Point, 446 Flash Point, 4.3 HT/HS, 12.0 TBN
Both oils are awesome and outstanding in shared sumps and good for water or air cooled (except in extreme temps where you would need a 20w50), but based on the data I found above....I have moved from Rotella to Delvac. Both my Honda XL600's love Delvac.