Oil in spark plugs well Volvo XC90
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not that uncommon - a few possible causes 1) oil spilled while filling 2) the seal on the oil filler cap is old 3) your PCV is clogged and is pushing some oil out of the filler cap seal 4) there's a tube that runs up to the top of the cam cover that may be leaking. This tube typically gets replaced when doing a PCV job.
So next step is to check your PCV system - try the latex glove test (see vids on Youtube)
So next step is to check your PCV system - try the latex glove test (see vids on Youtube)
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