The accidental releases of ship fuel oils have been responsible for coupled environmental, economic, and engineering challenges. In marine oil-spill response, fluid-mechanical considerations are crucial for predicting spreading, entrainment, emulsification, adhesion, recovery, and transport. However, many practical countermeasures remain industry-driven and are only weakly connected to academic advances in multiphase flows, in particular, interfacial phenomena and rheology. This gap has become more critical after IMO 2020, as the low sulfur fuel oil (LSFO) has been widely adopted. Compared with conventional heavy fuel oils, LSFO exhibits distinct composition-dependent rheology and interfacial behavior, including strong temperature sensitivity, wax-related viscosity increase, and partial solidification. The MV Wakashio spill in 2020 highlighted the limitations of conventional remediation methods for such fuels. This perspective reviews the compositional and rheological differences between conventional fuels and LSFOs, while focusing on fluid-dynamic challenges across stages ranging from spreading prediction to transport for onshore storage. We further discuss future opportunities, including AI-assisted methods and multiphase-flow strategies for improving recovery robustness and transport efficiency.