Oil pan
Oil may leak from the sump drain plug.
Oil leakage from the filter
Oil may leak from under the oil filter.
Checkpoint
Transmission oil can leak from the axle shaft seals at the exit from the differential protective cover.
Antifreeze
Antifreeze leaks can often be identified by these crystalline deposits.
Brake fluid
Leaking brake fluid leaves marks on the tire.
Hydraulic steering fluid
Fluid leaks from the hydraulic drive of the steering can develop from the fittings.