Commonly refered to as 12-point & 6-point.
For tough bolts/nuts you NEVER use a 12-point wrench or socket.

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2007 C 230 Sport.

But, all the cheapo sockets are 12-point. Less material, lower shippping weight, etc.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

Really.

I can insert the hose on my kit until it hits bottom. I can feel and hear it.

I can also measure the amount of oil that is removed. I can compare that to the stated capacity.

I don't do either of the latter, however, because Mercedes DESIGNED the engine for this technique. It all comes out. I of course do this with car level, as does the Merc dealer.

Never overfilled adding the required quantity.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

The final outcome was that I already had a set of the craftsman bolt out sockets, and had to tap one on with a large shop hammer, then a long breaker bar turned it out.
I'm not sure if the plug was originally a 14 or 13 mm head,
The 13 mm 6 point socket fit on it exactly without any play
I had it seated all the way to the flange on the bottom of the head. The replacement has a 14 mm head, so maybe the original was at one time that size and was worn out, and that is wh
y it rounded it off.

I've ran across this problem several times. The best way I've found is to use a air hammer with a chisel and hit the round side of the plug. Be very careful to just hit the plug and not the oil pan.

103-589-02-09-00 (oil filter wrench)
Crucial for M102/M103 with spin on filters.

117-589-02-07-00 (drain plug wrench)
Essential for all MB vehicles, long handle 13mm 6-point wrench with the 14mm allen drive on the opposite end.

If you wish to avoid future drain plug issues look into a Mighty Vac evacuator system. They make one that is around $100.00 (US) and it is great for home use.

Yes, that is the method preferred by people that do not wish to see what is going on UNDER their vehicle.

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2007 C 230 Sport.

Also by people who do not wish to get very dirty.............anymore while working on a car

I use a hand vacuum pump and it does take time. It helps to have the oil hot so that it flows easily, bit not as hot as to melt the plastics on the tube insert...

I prefer the drain plug method anytime, if there is any debris it will come out more likely from there.

Yeah.........I know.
My M-B mechanics wear WHITE Labcoats, hence the $ 90.00/hour they charge.
I still wear my " Farmers Cover-alls ".

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2007 C 230 Sport.

My wife quite washing mine so I switched to the "White Lab" coat..................now I tell her their black becuse of diesel oil