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Old 03-02-2010, 04:19 AM   #1 (permalink)
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Oil Change through dipstick tube

It is time to do an oil change in both the ML and the E420...

So, I thought I would change my procedure and pick up an oil transfer pump like a Mityvac or something to do the oil removal through the dipstick tube.

Any recommendations on a reasonably inexpensive but good pump?
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Old 03-02-2010, 04:28 AM   #2 (permalink)
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MityVac

Quote:
Originally Posted by davegt View Post
It is time to do an oil change in both the ML and the E420...

So, I thought I would change my procedure and pick up an oil transfer pump like a Mityvac or something to do the oil removal through the dipstick tube.

Any recommendations on a reasonably inexpensive but good pump?
You already mentioned the one I use, found cheap on eBay, works great.

Just don't get the oil Too hot, it will deform the plastic tubes, they tell you in the instructions.

Either stop running the engine before it reaches normal temp, or wait a half/hour or so after you stop motor.

this is not the pumps fault, it's the plastic tubing, probably the same for any pump you buy.
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Old 03-03-2010, 06:27 AM   #3 (permalink)
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Is this method as effective as draining through the sump plug?

My mechanic does this with a container that has a vacuum but I always felt it doesn't remove as much oil as draining from the sump would
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Old 03-03-2010, 07:49 AM   #4 (permalink)
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Originally Posted by fifalex View Post
Is this method as effective as draining through the sump plug?

My mechanic does this with a container that has a vacuum but I always felt it doesn't remove as much oil as draining from the sump would
I've always felt the same, however, since having an MB oil pan off the car, I can say that, fully drained when pretty warm, there is still about 1/4-1/3 of a quart in the pan due to the way it is shaped. It was certainly this way on my 420 SEL's pan, and based on the color of the oil immediately after the first change on my E320, and looking at the pan itself, the same thing happens in this engine's sump.

I've since decided it'll be faster, easier, and I'll get to look at some items while doing it, to jack up the LR of the E320 so oil in the 'reserve' area can't hide from the plug drain. The drain on the 320's pan is at the right-front of the engine, so lifting the LR a decent amount will get it.

Plus, I'll not have a choice but to roll around and look at CV bellows and other stuff typically not noticed until it's past fixing the existing part(s).
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Old 03-03-2010, 12:57 PM   #5 (permalink)
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I got a miyvac on amazon--it hold about 8L. I would highly recommend oil changes with this method. There will always be some old fluid left, no matter which method
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Old 03-03-2010, 09:10 PM   #6 (permalink)
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If you have a compressor, DO get the model that hooks up to same. It will shorten your 'pump time' exponentially.

Lots of dealers drain oil through the dipstick. What I do is alternate. Once with the compressor and then alternate by pulling the plug on the next change. I think that's the best of both worlds. Make sure your drain plug is magnetic as well.

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Old 03-04-2010, 06:15 PM   #7 (permalink)
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I use a pump out system on my '87 300D. I back the car in the driveway (nice grade) this puts the dip stick at lowest point. Hook the pump up to the battery, insert the tube down the dip stick tube, turn it on and while it's pumping I get all the other stuff ready. Heat does not affect the tube as it is only for oil changes and doesn't deform in hot oil. I use this method on all the boats I work on and even more so with four stroke outboards to limit the amount of oil that may go overboard.
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Old 03-04-2010, 07:07 PM   #8 (permalink)
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Oil sucker

The dipstick tube does not end after it enters the engine block. It extends through the crankcase to the lowest point in the oil pan. The MityVac kit includes a plug that seals snugly into the dipstick opening. The plastic suction tube attaches at the center of that plug and need not pass all the way through the dipstick tube. The dipstick tube itself is used to withdraw the oil.

By this method, more oil will be removed than by draining. This is not to say a periodic undercar inspection is not a good thing.
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Old 03-04-2010, 07:54 PM   #9 (permalink)
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By this method, more oil will be removed than by draining.
You should say "honest" at the end of the sentence. Then we could all trust you implicitly. Or alternativley you could provide some support for the claim.
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Old 03-05-2010, 03:25 AM   #10 (permalink)
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The best I can do

Read mckellyb's post. The drain plug is not at the lowest point of the oil pan. This is true for the OP's car and all M117 engines. I cannot say for certain irt all MB engines.
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