16510-83000, essentially the same filter used on the 1.3 Samurai, I like to use the OEM Suzuki filters and I get mine from Low Range Off Road.
Regarding the grade of oil, the image is from the SJ413 manual, but it's essentially the same image in most Suzuki manuals - above freezing either one will work, the 10W30 is good for temperatures down to around -20*C, and the 5W30 can be used in colder temps.