Is it cleaner to extract or drain engine oil?
2 Answers
For most engine models, extracting oil is cleaner than draining when changing engine oil. Introduction to Engine Oil: Engine oil, also known as engine lubricant; it serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine. Precautions for Using Engine Oil: Choose engine oil based on the engine's requirements, selecting oil that matches the engine; opt for multi-grade oil, which offers advantages such as fuel efficiency, long service life, and high performance, providing better protection for the engine; the oil level should be slightly below the mark on the dipstick, avoid overfilling.
From my experience in car repairs, I've seen many oil change jobs, and based on that, draining the oil tends to get rid of the old oil more thoroughly. Suction oil changes use a vacuum pump to extract oil through the dipstick tube at the top of the engine—sounds fancy, but sometimes it doesn’t get everything out, especially in older cars or models with sludge buildup. Residual debris and particles in the oil pan corners can remain, potentially accelerating engine wear. Draining, on the other hand, is straightforward: just remove the drain plug at the bottom of the oil pan and let gravity do the work, clearing out most sludge and preventing residue from clogging parts. In my opinion, at dealerships or professional shops, draining is the go-to method—it’s quick, cost-effective, and ideal for routine maintenance. Suction might suit high-end cars or tight spaces, but it’s not the most reliable primary choice. I’d recommend regular oil checks to extend engine life.
