Meritor - Fluid Reference Meritor fluid capacity and maintenance interval reference. Select a model to view service specifications. ModelYears Bus and Coach rearaxles- Double reduction axles - tandem axles- Single reduction axles- Single reduction axles - MX, RF, RS- Single reduction axles - steered, FDS- Single reduction axles - tandem axles- Single reduction axles - tandem axles - RT- Tridem axles, RZ-