According to some web pages, pumping engine oil is a bad idea because it lease a lot of old engine oil in the engine.
Is it really a bad idea?

I see some engine oil pumps at good price.

$17.75 , 12V oil change pump


$24.99, 12V oil change pump


$44.99, hand pump

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1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.

drain it. You'll see the worst of the worst that way.

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89 300te 222,222
92 300e 190,000

IF DONE PROPERLY, oil evacuators can be better!! In theory, a good oil "sucker" (as I call it) creates a vaccum in the engine helping to pull a lot of residual oil down off cylinder walls ect. ect.
I wondered which was actually better, till one day a client had her drain plug completely rounded off by "Jiffy Lube". I used my oil extractor first, then worked the drain plug out. When the drain plug finally came out, not a single drop of oil fell out. So in my opinion, extractors work really well.

There are a two things to remember though for best results: #1 You need to start with a good extractor. Niether of the ones you pictured look like they're worth a damn. I imagine the best ones work off of compressed air. But this is coming from a guy who has never used an electric one. #2 the oil must be pretty warm before you extract it, just do it after getting home from a normal drive.

I'm sure people could debate this for a while, but my oil extractor has been great for the last five years. It's really best used when I have multiple jobs to do on a vehicle. I hook the extractor up when the vehicle is warm, leave it on while doing other jobs, and then replace the filter and fill it up before I go. one little bonus is that if it's left on for over twenty minutes, the oil filter comes out nice and clean -not dripping all over everything.

I own a 5 1/2 gallon extractor made by CP from harbor frieght.

This argument has been brought up here countless times.

There are those who believe topsiders are better for all sorts of reasons and then there's the "from the bottom" crowd that likes to look around down below every 3000 miles.

There will be countless posts on this thread and 1/2 will go one way and the other 1/2 the other.

Believe whatever you choose because there is no right or wrong answer here.

Just be sure to do it every 3000 miles.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"

for me its a matter of not wanting to get under the car unless I absolutely have to....

I pump out my wife's expedition this way as well now.... in addition to the two benz's however with her truck I still have to get under to do the oil filter....

i don't think one way is better than the other...it's preference....

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1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

FWIW, most, if not all dealers suck it out. Ask yours.

How important is the levelness of the ground surface for oil change?

If I drain oil from the bottom, should I raise front and rear of my car by equal amount? My car is 1992 300D (W124, 602 engine).

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1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.

It's easier to extract the oil on the M103, (104too?) and the filter is up top. No need to skin your knees or bang your head.

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Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.

Which ever floats yer boat !! True, some dealers evacuate it from the top, some put it on a lift and do it the old fashion way here in CT.

I use (and like) the Topsider on my 500E every 5000 miles, but every third change I dropped it out from the bottom end and let it drain overnite 'cause the Mobil 1 tends to take its time, even hot it seems.

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Jim

1992 500E
2007 CLK63
2003 Audi RS6
2001 Audi allroad

I typically drain the oil from the bottom until it is just coming out in drops,,,, put the plug back in, lower the car and do the oil filter, taking my good old time. By the time I take the car up again and pull the plug out I always get about another 1/3rd to 1/2 of a quart of oil. Put me down for a bottom drainer.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K

How heavy and how big is this thing?
How weak is the suction power compared to the machine that dealers use?

MityVac 7201

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1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.

I preffer to drain becasue there is always some of the heavy crud that can accumulate in the bottom of the sump that won't be sucked out....

While its possible it may not make a difference I like to take as few chances as possible with this. Since the two I have can be changed without even jacking the car up.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

The important part is to just do it. Neither way is superior by much, if at all. As for getting crud off the bottom of the pan, the topsuckers will do as good a job as the drain plug. The drain plug is off to the side and doesn't get everything. The sucker needs a slight bevel on the end of its tube, so it doesn't get everything.

As for the idea that a sucker will create a vacuum inside the engine and get oil off the cylinder walls, that's ridiculous. BTW, it's etc, not ect, for the Latin words et cetera.

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Norm in NJ
Next oil change at 230,000miles

Like Lee said, if pumping it out makes you change the oil more often, then pump it out.

The dealers pump it out because it helps their work flow.
1) They don't have to drive a car to another bay for an oil change
2) They don't have to devote a bay for oil changes.
3) They can do an oil change while doing other work on the car, which may not be driveable at the time.

I drain it, since I prefer not to have any more tools than I need to clutter my garage.

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95 E320 Cabriolet, 159K

"The dipstick tube has an enlarged cross section and a formed extension at the top end. On the other side it ends a short distance from the oil pan bottom. Engine oil can be extracted using the dipstick tube.
Note: Inserting tubular probes through the dipstick tube is NOT recommended."

So the tube should be attached at the top part of the dip stick tube?

I did not make decision, but if I buy, I might buy this one. It is a couple of dollars cheaper than MityVac 7201, and is simpler (thus more reliable, I hope).



boneheaddoctor,

Can you drain oil without jacking the car up? I guess it is difficult to remove and install the plastic pannel without jacking the car up.

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1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.