Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
Mentioned: 0 Post(s)
Quoted: 35 Post(s)
RE: Oil extractors anyone?
Pyro, while I respect your opinion -- and also personally prefer to drain the oil the old-fashioned way (I did a drain-method pictorial DIY that's stickied in the 210 forum) -- here's a few points to ponder, all of which are restricted to MBZ vehicles.
1. There are tens of thousands of dealers, independents and DIY-ers who prefer vacuum extraction.
2. If vacuum extraction of engine oil was not approved by the company that designed, engineered and BUILT the engine in the first place, the dealers wouldn't do it, because it would void the warranty.
3. No one has been able to show any correlation between premature engine failure and the preferred method of oil change.
4. I can't remember if it was on this forum, but a member drained the oil from his V6 320 (can't recall if it was an ML or a sedan, not that it matters) and then stuck the extractor in. He claimed he extracted another 6-8 oz of oil. Now it could be he had the front end on ramps so the oil collected in the back of the pan, but either way it's pretty clear the extractor is getting virtually all of the oil out. Moreover, it reinforces the idea that the engine was designed with vacuum extraction in mind.
5. There are those of us who will never use the vacuum extractor because we hold to the idea that a long drain process allows some particles, impurities and other heavier junk (real or imagined!!) that have settled into the bottom of the pan to run/drip on out with the more rapid flow of oil that occurs through the open drain plug hole.
6. Proponents of vacuum extraction argue that not only is it a time saver, it precludes opening up the crankcase and exposing it to dust and dirt entering through the drain plug hole. Plus you'll never strip a drain plug bolt or have to worry about it leaking.
7. Drain-folk, like you and I, counter that removing that big plastic pan and letting the oil drain gives you a chance to conduct a visual inspection of areas usually hidden that might reveal the potential onset of other problems.
8. Vacuum extractors don't suck oil up through the whole engine; rather, they draw it up through a tube that extends clear down into the bottom of the sump. As the oil is extracted, all it touches is the inside of the tube.
9. MBZ dealers have been using the vacuum extraction method for a long, long, long time. Were there problems with it, they would have surely cropped up by now.
I think this pretty much summarizes of the varying viewpoints spread throughout the various forums. The concluding point being, neither way is "right" or "wrong": it's really a matter of personal preference. What's to be gained by castigating those who choose to follow a procedure that is approved by the company who built the car?
Take care and enjoy the ride,