Can All the Oil Be Extracted from a Passat?
3 Answers
Not all the oil can be extracted from a Passat. Methods for extracting oil from a Passat: If a large tube cannot be inserted, a smaller tube can be used instead. It is recommended to use a thin straw-sized tube to insert and suck out the oil. Locate the gasoline filter under the car's cabin—ask a mechanic for the exact position—and unscrew a bolt below it to allow the gasoline to flow out. This method can extract a small amount of oil. Types of car fuel tanks: Fuel tanks can be divided into two types: open and closed. Open fuel tanks have a liquid surface exposed to the atmosphere, with an air filter installed on the tank cover. Open tanks are simple in structure, easy to install and maintain, and are commonly used in hydraulic systems. Closed fuel tanks are typically used for pressurized tanks, filled with a certain pressure of inert gas, which can reach up to 0.05MPa.
I've been driving a Passat for many years, and every time I go for an oil change, I ask the shop to use the oil extraction method. To be honest, it's pretty thorough, removing about 95% of the old oil, but it's not completely 100% residue-free. This is because of the engine design—there are always some residues left in corners of the oil pan or dead ends of the pipelines that can't be extracted. The newer Passat models are slightly better in this regard, while older ones may retain more. However, this doesn't affect the performance of the new oil. The key is not to forget to replace the oil filter at the same time, as mixing residual old oil can lead to carbon buildup or affect lubrication. I recommend not attempting this yourself—find a reliable repair shop for extraction. They have professional tools and can also inspect other potential issues to avoid hidden problems. Regular maintenance is crucial; once the oil gets dirty, engine performance declines, affecting its lifespan.
Buddy, I've done the oil extraction thing on Passat a few times and can basically handle most of the old oil. I've tried using those hand-crank oil extractors – works decently, but there's always a tiny bit left in the engine block, probably due to design. Newer models or TDI versions get it cleaner. Don't sweat it too much – a small residue of old oil mixing with new won't cause major harm, just don't skip changing the oil filter. I usually do it annually or every 5,000 km to avoid engine overheating damage. Remember to measure new oil precisely after extraction – no over/underfilling to prevent fuel economy issues. DIY saves money but is error-prone; sometimes it's worth paying a shop for hassle-free service.
