Valve stem seals, Ford 4.6L engine

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Someone please tell me when Ford changed Valve stem seals so that oil consumption isn't excessive after 70K miles +/-. I'm reasonably sure that they did, but don't know when. I like the product and wan't another, but without the oil problem.

I have conflicting info. one is that it was in 1996, the other was 1998; both might be wrong.

Thank you.

T
 
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