Drips and smoke are not the only signs of oil leak. Current autos:
2003 Chrys TC minivan - 204352 mileage, no oil drips on floor, but minor drops from seal that burns off within seconds of squeezing out of engine periodically, change every 7k and never seen a loss on stick.
2010 Mercedes 350 - 289458 mileage, oil drips constant, change every 7k and always see a loss on stick. Oil burns off on back of engine from seal, what does not burn off, works it's way along the undercarriage shield and collects dirt until it's almost a solid in the rear of the shield back by rear tires. Usually drops off in big chunks when we hit a large bump like a cow patty if I don't get to it during a lift inspection.
2019 Hyund Sonata - 125234 mileage, no constant oil drips, but minor drops burn off on engine, change every 7k and never seen a loss on stick.
A quart of oil every 1k is unacceptable, every 5,000 or 10k is unacceptable for any engine that you would consider reliable.
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