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You can always swap plugs at 35k if you really need them immediately due to misfires or poor operation, then swap back to the used plugs right before you go in for 45k service. You'll have a fresh set in the car, and a set with only 10k on the shelf.
Of course, if your service is cool and will just give you the plugs even better, saves you labor later to swap again.
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2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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