Nearly 150,000 Pontiac Fieros may be in danger of catching fire from oil that escapes if owners fail to keep the crankcase filled, according to complaints that prompted an intensification of a federal safety probe.

GM in 1987 agreed to recall 126,000 1984-model Fieros after similar reports of fires. The 1985 and 1986 Fieros had the same oil-system design as did the 1984 models.The engineering analysis affects 147,571 1985 and 1986 Fieros.