Is the car clean after changing the oil?

[SanMakayla]

After changing the oil, the car becomes relatively clean. Engine oil is extremely important for the engine, as it serves the functions of lubrication, heat dissipation, cleaning, and sealing within the engine. Engine oil can be considered the lifeblood of the engine. If the engine oil is not changed for a long time, its lubricating performance will degrade, leading to abnormal wear and tear on the engine. The method for changing car engine oil is as follows: 1. Wait for the engine temperature to cool down, allowing the oil to flow back into the oil pan. 2. Use a wrench to loosen the oil drain plug and place an oil pan underneath to catch the old oil until it stops flowing. Then, start the engine for about 30 seconds to allow the oil in the main oil passage to drain out. 3. Use a special wrench to remove the oil filter; apply some oil to the oil seal of the new oil filter and tighten it clockwise by hand. 4. Add the new engine oil through the oil filler cap on the engine valve cover, typically filling about three-quarters of the oil container. 5. Start the engine and let it run for 5 minutes, checking for any leaks around the oil drain plug and oil filter. 6. After stopping the engine, pull out the oil dipstick to ensure the engine oil level is within the standard range.

[OPreston]

Just watched a mechanic change oil at a friend's repair shop, quite interesting. After adding new oil, the sludge on the engine's inner walls was washed away—the old oil was actually blacker than ink. But with the new oil in, the whole system feels brand new. Two things to note: if the oil pan bolt isn't tightened properly, it can leak, and if the oil filter isn't installed correctly, it can splatter oil stains. The mechanic marked the bolt with a highlighter, saying it helps the owner check for leaks themselves. Also, the edges of the oil filler port should be wiped clean with carb cleaner, otherwise residual oil droplets can smoke when heated. I even checked the ground at home to make sure there were no oil stains before feeling at ease.

[GraceRose]

I've been driving my old Buick for almost twenty years and have plenty of experience with oil changes. The new oil poured in looks crystal clear, but there's always some residue left during the process. Apprentices often spill a few drops into the engine bay gaps, which can produce blue smoke when heated. Once after a service, I smelled something burning while driving and immediately pulled over to check—it turned out to be oil splashed on the exhaust pipe during refilling that had evaporated. Now, I always insist that the mechanic wipes around the engine three times with an oil-absorbent cloth and have the shop manager inspect the oil pan bolt with an endoscope to ensure zero oil stains before considering it done.

[GideonLynn]

Watching the mechanic sweating profusely. He said they now use a vacuum oil extractor that can suck out every last drop of old oil through the dipstick tube. But there's always some oil sludge stuck in the threads of the drain plug, which requires special cleaner to flush out. When adding new oil, the filler tube must be inserted all the way, otherwise oil splashing onto the pulley will spray droplets throughout the engine bay. Here's the key part: After finishing, the mechanic had me start the engine and idle for three minutes, then lifted the car for a secondary inspection. Sure enough, we found a bolt seeping oil - only after tightening it did everything become completely clean.