Nice review Eric.
I've always liked the idea of the Oil Can set, being the hardcore SP fan that I am, although Lionel's SD40T-2's diesels are a disappointment to me; too many prototypical issues with them (truck placement being way too far inward from the pilot steps & incorrect nose lights for the SP version being the main ones).
Might spring for a broken-up set with just the tankers and pull them with the MTH SD45T-2s as those are more accurate models.