i am thinking AMDEP will put K230 on Sv 58 very soon? MK IV go
over to Sv 138?
I suppose units of mk iv from 162 and those random buses like 976K
might go out and those services get euro 4 or 5. Of cos, depot
transfers of spare volvo mk 4 is possible, though mk 3 is doubtful
cos amdep have none of it at all, so
they might not penetrate into amdep like LO being kept within am/br
& slbp only
For 138, it might upgrade directly to euro V than volvos esp in
view of its "ambassadorial" status as a bus to attractions like
zoo.
Other amdep/brbp services yet to use scania like 135, 139,
145 might have a "merc-ciless" evolution 
aft 2 years and level up to full euro
v and the new lot of SDs coming next year or so, just
like how 33 receive 7 euro iv at once to replace N113 back
then.
These are just suggestions, pls dont take it hard. 
