Oil draining or oil extraction when changing engine oil, what is best for real ?


hello,

it seems that the official procedure from Benz for any C-class W205 since 2014 is vacuum / extract from the top, can you confirm ?

My feeling is that this procedure is not as good as draining, but Benz engineers cannot be totally dumb ? what do you think ?

But still, I think that if oil has never been drained in my car, I should at least once try to go where they will drain it to change it.

Thank you for your ideas.

Mercedes vacuums the oil out. Thats what I do, I bought a pump and I vacuum it out and replace the filter from the top.

No brainer. Extract. Easy and clean.

It is your car do whatever you feel is right.

thank you, but do you know if a manual pump is good enough ? I read that we need an electric one for a better job ?

​​​​​​​Not being an expert, I prefer to rely on informed people.

And it seems that my negative ideas about vacuuming oil was wrong, not sure that draining is actually better.

The manual Topsider works, but didn't last. There are other manual pumps on the market but I haven't tried them. I just posted another thread showing what I have used. I like the pneumatic one from Harbor Freight the best.

Nothing beats a quick hot drain of engine oil, when you drop red hot motor oil it carries contaminants out of the engine.

I prefer draining as I can check suspension, brake, driveshaft, radiator, belt, oil leaks, etc while under the vehicle. Buy a good quality ramps.

The question needs a survey of how much oil is extracted on average by the suction method. If its routinely just a few ounces short of the 7 quart capacity, it's not a big deal. I doubt it would make any difference in engine condition for hundreds of thousands miles with good syn oil. Syn oil doesn't break down in the same way as "dino" oil and doesn't produce the same level of contaminants.

I checked the service procedure for my w213 (same engine ) and it has the top side evacuation listed in the factory instructions.

I read many reviews and the same amount of oil is changed when draining or extracting. Never all oil will be drained even when using the old fashioned procedure.

I pulled 7+ quarts out of my wife’s car with the extractor. I put in what the manual calls for and it’s perfect.

Drain is the best, in regards to empty the pan total.
With extraction you will always leave some oil in the pan, not much, but still.

I like though to drain the oil for different reason.
I put a piece of filter cloth into the pickup bowl, just to see the "dirt" if there are any signs of wear, like white metal from the bearings, other metal or plastic grain, and how does it smell, ?
Also look for water, it comes first, when unscrewing the plug.
All that you don't see, if you extract the oil.
Sure you can filter the extracted oil afterwards, but in my experience, most of the "dirt" always comes with the last oil, and you don't get that out with extraction.

I hear ya. I do the extraction at 5k miles, bottom side drain at 10k miles (consider this environment "severe"). Also when sending for oil analysis, bottom side to reduce risk of a contaminated container to transfer from.