Honda actually recommends an oil change every 8k, some go that long, most do not, some even go longer.
here is a list care of the VTXOA
Alternate oil filter part numbers
The following is a list of filter numbers that will work on the 1800 and 1300.
Motorcycle specific filters;
AC Delco PF2135
AMSOIL EaOM-103
FRAM PH6017A
Honda OEM #15410-MCJ-003
K&N KN-204
NAPA Gold 1358
Purolator Motorcycle ML16817
STP 07
WIX 51358
Car filters about 2.5 inches tall;
AC Delco PF1237
Bosch 3300
Mobil M1-108
NAPA Gold 1365
Purolator L14622
Purolator Pure One PL14622
STP S-02876
WalMart SuperTech ST6607
Car filters about 3.25inches tall;
AC Delco PF-2057
Bosch 3323
Castrol 7317
FRAM 7317
Mobil 1 M1-110
Motorcraft Long Life FL-821
NAPA Gold 1356
Purolator L14620
Purolator Pure One PL14620
WIX 51356
if you go to the VTXOA
VTX Owners Association you can find all the arguments you can stand about oils/filters.