What type of tool is needed to drain the oil on 4cyl 1990 camry?

It's a metric drain plug, I think 13 or 15? (I have an aftermarket drain plug installed now). Use a box end wrench not a crescent wrench as you may round off the drain plug. Also, if the last person to change your oil wrenched the oil filter on, you will need an oil filter wrench to get it off. Other than that, a funnel to pour the oil without spilling, a drain pan to catch the oil as it drains out, and a few rags to wipe dirty oil spots should do ya. Wait until the engine is warm not hot since the oil filter is right by the very hot exhaust manifold.

Crensant wrench sould do it it adj in size