How often to change oil drain plug gasket?

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afpj

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While trying to track down the multiple potential oil leak sources, I've discovered my 2002 Yukon 5.3 4x4 (194k) drips even when sitting. Only a drop or two a day, but never did before. Then I realized in 18 years of owning it, I've never changed the oil drain plug rubber gasket...never knew it came out to replace. So how often do people change that out? I replace aluminum etc washers in other vehicles about every other OCI but never on Yukon. Yup, I'm an idjut.
 
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