Correct answer
Parked on flat, level ground.
On level ground without a slope, so inclination does not distort the reading. Follow manufacturer instructions on stopping the engine, temperature and waiting for oil to return to the sump. Not every engine requires a cold check; do not generalise one temperature or waiting period.
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Parked on ground with a slight downward slope.
Parked on a slight upward slope.
Parked on flat, level ground.
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