In relation to the XC60 - this gets compilcated - but here is the list from the latest XC60 brochure. IMHO anyone ordering the diesels without the geartronic deserves their head read anyway
3.2 Auto - 1800/90 (braked tow limit/nose weight)
T6 Auto - 2000/90
2.4D Man - 1500/75
2.4D Auto - 1800/90
2.4D Man 4WD - 1800/75
2.4D Auto 4WD - 2000/90
D5 Man 4WD - 1800/75
D5 Auto 4WD - 2000/90