Table: t_1957_pescara_gpp
Columns: driver
constructor
laps
time_retired
grid

Question: Who drove the maserati under 18 laps with an oil leak that had a grid of under 14?
SQL: SELECT "driver" FROM t_1957_pescara_gpp WHERE "constructor" = 'maserati' AND "laps" < 18 AND "grid" < 14 AND "time_retired" = 'oil leak'