What do you do if you notice an oil leak in the engine of a Toyota Camry?

First, find out where the oil is leaking from. If it's leaking from the drain plug you might get by with just getting a new drain plug gasket and changing the oil. It could also be leaking from the oil filter in which case just change the oil filter. If it's leaking from the rocker cover gasket or the pan gasket you can drop the pan or remove the rocker cover and replace the gasket but if you haven't done it before it might be a little overwhelming. It might be leaking from the "rear main seal", that's the seal on the crankshaft of the engine where it connects to the transmission. If that's the case you have some expenses ahead of you. Just plan on adding oil when it gets low and start looking for another car if you don't want to spend that much money.