engines
There are many internal combustion engines powered by gasoline, diesel, propane, or natural gas; hybrid vehicles, plug-in hybrids, hydrogen-powered fuel cell vehicles, and all-electric vehicles. Fuel-powered vehicles have an advantage due to their limited range and high battery costs. Some options require a network of refueling or charging stations.
Replacing the front crankshaft oil seal
If you find traces of oil leakage through the crankshaft oil seals, first check to see if the crankcase ventilation system is clogged and if its hoses are pinched, and repair if necessary.