It has an O-ring.
The oil drain plug on a 1995 Nissan Pathfinder is located under the engine. Maintenance includes replacement of the oil pan gasket.
It should be on the drain plug.
A drain plug gasket is a washer type device made of plastic or other non porous material and is used between the drain plug and the oil pan to prevent leakage when the drain plug does not fit snugly in the oil pan
Remove the engine oil drain plug. Remove the oil filter. Put back in drain plug. Lube the new oil filter gasket and then install. Then add new engine oil.
The engine oil drain plug is on the bottom rear of the engine oil pan. The transmission does not have a drain plug, you remove the pan to drain.The engine oil drain plug is on the bottom rear of the engine oil pan. The transmission does not have a drain plug, you remove the pan to drain.
Could be the leak is coming from higher up like a pan gasket or rocker cover gasket, and collecting on the drain plug. Bad drain plug gaskets usually leak continuously whether the engine is running or not.
Drain at bottom of radiator so you can get antifreeze out.
Replace the drain plug gasket and don't over tighten it.
No transmission drain plug. You have to drop the pan, then replace the filter and gasket.
You drain the engine oil from the drain plug on the bottom of the oil pan.You drain the engine oil from the drain plug on the bottom of the oil pan.
Answering "Where is engine coolant drain plug for a 1.8 Nissan sentra engine?"
There is no drain plug. You can try to suction out the lube but you really need to remove the rear cover to completely drain the differential. And buy a new gasket (or make your own from gasket stock material) to reinstall the cover; use a gasket sealant sparingly on the gasket and bolt threads to get a good seal.