You did not say what year it is, and that makes it tough to answer. But you can look at this. I think your engine has 2 oil cooler lines that start at the top of you oil filter and runs to the radiator. Your oil filter is screwed onto aOIL FILTER ADAPTER If you remove the filter you will see 2 bolts that hold the adapter to the block. If your oil lines are leaking were they hook to the adapter then get 2 o-rings from parts store and remove lines and install the o-rings onto the ends of the lines. If the oil is coming from the top of the oil filter then go and buy yourself a oil filter adapter gasket kit and remove those two bolts that I was talking about earlier and replace the gaskets.
Standing in front of engine it is on the left back bottom side of the engine, just above the oil pan. Need to lay under truck on left side and look up.
Standing in the front of the engine, It will be on the back bottom left side of the engine. You will have to lay under the engine to see it.
It is on the left or right side of the truck by the fender well on the engine.
Standing in front of engine, It is on the bottom left side of the engine under the exhaust manifold towards the back.
It will be on the left bottom side, towards the rear of the engine. while standing in front of the engine.
Need to know what size engine you have.
Standing in the front of the engine it will be on the bottom back left side of the engine. Will have to lay under the truck to see it.
Lower left side of engine.
It's a left hand thread. Crank to the right.
standing in the front of the engine, It will be on the left front bottom SIDE of the engine.
I believe it is on the left side as you look at the engine under the intake and bolted to the side of the engine.
Some marine engine's may rotate in opposite direction need to check rotation of engine