If your vehicle is showing oil level drops rapidly requiring frequent top-offs, here are the most likely causes and the parts you'll need to fix each one.
A loose oil drain plug, missing crush washer, or a double-gasketed oil filter from a recent oil change will cause rapid, severe oil loss while driving.
The rubber gasket sealing the top of the engine degrades over time, allowing oil to leak down the side of the engine block or pool into the spark plug tubes.
A stuck PCV valve or failed oil separator can suck engine oil directly into the intake manifold, causing the engine to burn it rapidly without leaving puddles.
The seal at the bottom of the engine block can dry out, shrink, and crack, leading to steady drips and noticeable puddles under the vehicle.
Hardened or worn seals allow oil to seep down the engine valves into the combustion chamber, typically causing a noticeable puff of blue smoke on cold startups.
The large seal between the engine and transmission can fail, causing a major, continuous oil leak at the rear of the engine block.
Worn internal engine rings allow oil to bypass into the combustion chamber and burn continuously while driving, often accompanied by poor performance and constant blue smoke.
On turbocharged vehicles, internal seal failure can dump engine oil directly into the exhaust or intake piping, causing extremely rapid consumption and heavy smoke.