I need new spark plugs. my old ones are very dirty with oil. What is a likely cause for this?
Probably worn valve stem guides.Also if there is white smoke when you decelerate or right after coasting down hill is another sign of worn valve stem guides.
Is the oil on the inside or the outside of the spark plugs.
The problem could most likely be caused by a leakage or over using it. You need to change your oil every once in a while based on the mileage that the car goes. Talk to a mechanic to get assistance.
Yes they are dirty but what are they out off , a car or motorcycle 2 or 4 stroke. Oil on them means thier is an oil problem.