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Hello. My name is Tan.
Have you had the spark and compression checked on the engine?
These are the first things we test.
Over oiling is caused by the fuel oil system sucking air on the fuel side. This causes the VRO pump to cycle faster causing over oiling. Loose fuel lines or old hard fuel lines will cause an air leak. The VRO pump if tested will test as good.
This is the only thing that will cause over oiling.