what should i change when i find oil leak aroumd oil pan assembly?

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a leak there around oil pan assembly i went many services stations some of them adviced to replace all oil system include gasget and cylate and othe parts, the other one said i'll change drain and let see if its enough or not. but still confused if its a cretical issue in my vehicle or not because i dont want this issue to cause a big fauiler in the future. i've this issue for a year, but when i asked technical guy who changing vehicle oil peridically he said not that much shortage in the oil.