Mobil 1 Peak Life 5W-50, BMW E39 540iA, 21548 km

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OVERKILL

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Originally Posted By: camrydriver111
I believe a Teflon outer seal goes overtop of the "rubber" VANOS seals so I don't know how much exposure to oil the inner seals get. I've read the inner seal is what fails and shrinks. When I pulled my VANOS seals after 160,000 km they looked good, although I have a late production car, maybe they changed the formulation.
This is correct, it is the O-ring underneath the teflon seal/ring that compresses, shrinks and hardens.
 
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