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Identify
The little round thing with the two leads on top is the oil sender unit. The blue thing is drain plug for radiator. It is brittle.
Leaks can come from anywhere. You'll need to clean the engine to find where the leaks are. Clean it with an engine cleaner and a hose following the instructions on the spray can. Another way to find it without cleaning is to get the oil additive that glows under black light. That will show the leak without cleaning the engine.
Typical leaks (that I've had) are balance shaft housings, balance shaft seals, balance shaft end plug, oil sender units, oil pan gasket, gasket between oil filter housing and block. As the years go by the oil pan gasket is slowly cooked where it is near the exhaust. Mine is leaking there and I am currently changing the gasket and rod bearing while I'm at it.
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