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Not using OD should not be much of a problem.. You just ran with higher RPM that you needed too.
The black could be carbon from overly rich fuel.... It could be oil too I guess?
Running with low oil is not doing the engine any favors... A white gob on the dip stick does not say much... It might indicate that the oil level was low, and that you drive very short trips often?? Do you?
If I were you and I suspected a bad head gasket, I would do a engine leak down test, or have one done. That done well will pin point many things including a bad head gasket.
You can add proper oil,to what is there, or you can change the oil and filter to maybe just ruin it.. I would not use this car at all untill testing has been done...
You can look in the coolant for signs of oil. You can look at the oil filler cap bottom side for signs of condenced water/coolant, and smell it for signs of coolant.. if it is white gook and does not have a sweet odor it might just be condenced water??? If it smells sweeter your in for some workings for sure..
You can do these simple tests with not even running the engine.. Coolant in the oil is pretty bad for engines.... Coolant displaces oil from bearings, and cly walls and must be cleaned up well as the work happens to allow.
Black smoke at the tail pipe in day light indicates too much fuel.
White smoke is not smoke but steam....
Blue / gray lingering smoke is oil...
You may have one or all 3 smokes mixed depending on what the causes are.
I can't tell with out seeing and or getting more info... Mac
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