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benzw205
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Discussion Starter #1
C-class W205 oil change, Oil draining or oil extraction, what do you think is best ?


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.
 

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2008 AMG CLK63 Conv., 2012 R350 4-Matic, Wife's 2015 C300 sedan
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Modern engines don't tend to produce as many metallic particles as their forebears did, and modern synthetic engines oils don't (usually and unless there's something wrong) produce as much sludge as old non-synthetic oils.

The main problem with doing the oil change on the C-class (like my wife's) is that it's a right royal pain in the butt to get the undertrays off to get at the sump plug. To save labor time, therefore, I suspect M-B has authorized sucking the old oil out of the top. I, however, am something of a luddite and still prefer the old fashioned way: get the engine up to temperature and drain with the oil still hot from the bottom. I do our oil changes myself, and getting under the cars and taking the undertrays off also gives me an opportunity for a quick look to check all is in order down below.
 

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benzw205
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Discussion Starter #3
Thank you. I have been reading a lot and some people say that for some engines vacuum procedure is even better than standard draining. I was thinking as you, but now I am almost convinced that Benz cannot be totally stupid and would not recommend anything bad for the engine.

I understand that getting under the cars and taking the undertrays off gives the opportunity to check all is in order down below, this is why I expected benz to drain the old engine oil...
 

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2008 AMG CLK63 Conv., 2012 R350 4-Matic, Wife's 2015 C300 sedan
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Wouldn't be so sure about that.

They've fitted smart alternators and now they're fitting hybrid alternator-starter units between the engines and transmissions. They've gone over to plastic elnsed headlights, now non-repairable LED ones, not because they're actually better, but because they're CHEAPER.

Remember Benz doesn't make money by selling ever-lasting cars either.

It's really down to the labor cost of getting the undertrays on and off and pressure from their stealerships to reduce the costs and up the profits on routine servicing.

Gravity is a wonderful tool for ensuring you get the maximum possible amount of old engine oil out. Not sure sticking a tube down from above is guaranteed to get that tube into the bottom of the sump, or to suck out all the gunk in the sump either. Hot oil and gravity much better IMHO YMMV.
 

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2008 E320 OM642 Bluetec1992 300D 2.5 Turbo (Sold @ 248k running strong), 1985 240D (sold)
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There's nothing new about Mercedes and the extractor method of oil changes. It was in the manual for my 1992. So it isn't some new conspiracy of MB. Dealers have been doing it for years with Momma Benz's endorsement.
 

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2008 AMG CLK63 Conv., 2012 R350 4-Matic, Wife's 2015 C300 sedan
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Fairy nuff...
 

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No better way to change the oil than sump plug removal .But if you use an exraction pump i would change it more often for the first 4 oil changes. And then every 6 monthes as normal after .
 

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benzw205
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Discussion Starter #8
No better way to change the oil than sump plug removal .But if you use an exraction pump i would change it more often for the first 4 oil changes. And then every 6 monthes as normal after .

Every 6 months ? and maybe 3000 miles ? you must be from US :)

Every year and/or every 10000 kms as it is done in EU is already more than necessary with high quality synthetic oil...
 
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