If the oil leaks into the spark plug well, it signals about broken gasket, broken pistons or also about broken valve guides. The problem is quite bad, so it should be fixed as soon as possible. Oil in spark plugs won't allow you to use the car. Here we discussed major problems of oil leaks: https://cararac.com/blog/oil-leaks-in-car-major-facts-you-would-need-to-know.html
So, if oil gets to the spark plug well, the spark plug stops working. It can't ignite the fuel anymore, so one cylinder will be dead. It will cause engine shaking and higher fuel consumption as well as significant loss in car power and torque.
If the problem occurs in one spark plug well, it usually says about local problems with piston or valves. But if the oil is found in all wells, the engine will probably stop working or will work poorly. In this case you'll need to look at gasket.
If the leak is minor, the engine will still be able to work, but it won't be working well. Shaking, sudden stopping and unintentional revving up will be a normal thing for it. Although, sometimes it's not that expensive to repair the engine and keep using it for years to go. So better don't wait for long until the spark plugs just can't work in the puddles of oil and contact the service station.
About the authors
The CarAraC research team is composed of seasoned auto mechanics and automotive industry professionals, including individuals with advanced degrees and certifications in their field. Our team members boast prestigious credentials, reflecting their extensive knowledge and skills. These qualifications include: IMI: Institute of the Motor Industry, ASE-Certified Master Automobile Technicians; Coventry University, Graduate of MA in Automotive Journalism; Politecnico di Torino, Italy, MS Automotive Engineering; Ss. Cyril and Methodius University in Skopje, Mechanical University in Skopje; TOC Automotive College; DHA Suffa University, Department of Mechanical Engineering
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