Correct answer
Parked on level ground.
On level ground, following the manufacturer’s procedure for that engine. Inclination shifts the oil and can distort the reading; uphill cannot universally be said to read high and downhill low because the result depends on the measuring location. Check with the engine off when the procedure requires it, observing prescribed temperature and waiting time. Not every engine must necessarily be measured cold.
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Parked on ground with a slight upward slope.
Parked on level ground.
Parked on ground with a slight downward slope.
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