Q: Are there lines that run from the spark plugs with o rings in them to keep oil out ?

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My car is at the shop they changed the spark plugs and the O2 sensor in front of the Catalytic converter. they said the lines from the spark plugs may need to be blown out as there are O-rings in them to keep oil out but there seems to be some oil in those lines

My car has 150000 miles.
My car has a manual transmission.

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