Can you replace an oil pan gasket without removing the engine?
An oil pan gasket can be replaced on most vehicles without the need to remove the engine. That said, in many cases, a number of other components - exhaust, steering, crossmembers, and the like - might need to be removed for access. Sometimes an engine must be freed from its mounts and raised so that the oil pan can clear a crossmember. And, in some cases, the engine might need to be removed.
Can you seal a leaking oil pan?
Whether or not you can seal a leaking oil pan depends on where the leak is coming from. If the oil leak is due to a bad oil pan gasket or seal, then yes. You can reseal the pan by removing it and installing a fresh gasket or sealant. If, on the other hand, you are referring to “sealing” a crack, hole, or corroded spot on your oil pan, then no. Sealing up a hole from the outside is no guarantee that you will keep the oil inside your engine and is not recommended.
How serious is an oil pan gasket leak?
If an oil pan gasket leak is subtle, yielding a few drops on the ground now and then, you might get away with simply monitoring the oil level and topping it off to ensure that the level does not drop too much. If the leak is significant, however, serious damage can occur to your engine from lack of proper lubrication. Low oil level is a serious problem for any engine.