White smoke after oil change and O2 sensor changed


Asked by Jul 14, 2019 at 11:00 AM about the 2004 Mercury Grand Marquis

Question type: Maintenance & Repair

Hi. I overfilled my car wiyh oil by one littre of oil. The car
started throwing white smoke from both exhausts. On the
same day i changed the O2 sensor so i thought that the
smoke is temporary and i kept driving for almost 10 days
than i realize that issue is something else. I rechecked the
oil level and found it to be high so i drain the oil and bring it
to correct level. Now 10 days passed and i am still having
white smoke with oil burning smel. I have checked engine
light with p0308. Upon checking the plug 8 i found that the
thread of the plug has oil in it. I am totally confused now. I
am not sure if the excessive oil is still burning or i may have
burned the ring piston. Kindly let me know. I am very busy
and may not be able to take the car to the dealer for
another one week. The car start smoking all the time but
mostly heavy smoke after an hour of drive or if i am idle
with engine on for sometime.

1 Answer


When you put too much oil in the engine it foams. When that happens the oil pump is sucking air bubbles instead of oil. So your oil pressure drops. Has the red oil light been coming on? I suspect that there is internal damage to the engine after driving it for 10 days like that! Hope that helps! Jim

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