I have a small inventory of Mobil1 5w30 5qt. jugs that I use for used oil, also what gets dumped into our vehicles 2x per year, which is usually 4-6k miles. Those are $26 at Walmart ($36 at Advanced Auto). And I use 90915-20004 oil filters! Highly recommend them.
82 fj40, 99 uzj100, 06 gx470
97 DR650, 05 525EXC, 06 TW200, 89 TW200, 09 TTR125, 07 TTR90, 07 CRF50