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The mkiv Supra Owners Club

Valve stem seals


Boyne

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As and when unless you were overhauling the engine in general?

 

It varies with age, usage and oil changes Imo so won't be the same. Saying that they must be worn before you notice the oil so you could do it as a future proofing thing, it's a bit like (more complicated sure!) the crank pulley change it and you're good for ages/ever?

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