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Oil from filler cap

  • Thread starter Gtholm1
  • Start date Dec 17, 2025
  • Forums
  • SEAT car forums
  • Leon
  • Leon Mk2 (2006-2012)
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Gtholm1

Dec 16, 2025
3
0
  • Dec 17, 2025
  • #1
Hi I have a Cupra that has smoke coming from the oil filler cap, the car will not start with the cap on and runs a bit rough with lots of smoke coming out of the cap when removed. I have changed the PCV valve and during a compression test all 4 cylinders are showing 130 psi
 
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