2000 buick regal oil leak

Have a significant oil leak. Have put a dye in engine oil seems to be leaking on oil pressure sending unit and from top of engine near throttle body. Also leaking above water pump by intake manifold. Put new valve
cover gaskets on. Any thoughts on how to isolate any further-does engine stop leak work oil additive.
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skidstar wrote:

Engine?
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If you can see the points of leakage, why would you need any further isolation? Additives like stop leak will only end up causing you bigger repair bills when you finally take it in to get fixed.
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