Funkwagen

The one I use actually came with the Mityvac 7201, fits perfectly

MB Marko

perfect thanks!

edgalang

How could I have missed this. I was under the impression that the rubber pieces were to connect the hoses together. It didn't even occur to me to use the dipstick tube AS THE HOSE. I'll be trying this on my 70k service.

white46

Well... I use 12v oil pump from ebay.
Hook it up to car battery, inlet goes to dipstick, outlet goes to empty jar. Never has problem last 5 years.

michail71

I don't think the dipstick vs. hose all the way down would make too much a difference in the grand scheme. Somewhere balancing the gravitational force, atmospheric pressure differential and surface tension there would be an optimal diameter. But if you can't get good hose placement the dip stick tube sounds like a great choice.

Even with a traditional drain pan plug draining I think you could let it drip from here to eternity and still not get everything out.

MB Marko

UPDATE:

Well everyone I did the first oil change with the MV7201, I san say it did take like 40 minutes this first time. as I was bound to make some mistakes HAHAHA.

Lessons I learned; Let the car warm up fully it will be done much, much, much faster. I found the car cooled down by the time i got 5L out.

for some reason i used the second biggest hose in the dip stick it still sounded like it was sucking out tons of air and I had to pump a ton of times to keep the oil coming.

next time in ditching the hose and just using the rubber seal and shoving it in the dip stick tube. I hope that works better than the hose.

I learned a lot by trying it the hard way this time. It was defiantly worth the DIY and money saved. It was also a lot cleaner than doing the job from under the car.

I feel like next time the job will be done in about 15-20 minutes, I was just too cautious this first attempt.

I was able to get the full 7L of oil out but i had to pump tons of times because of the seal issue. I must of pumped 15 times at the start 5L came out easy. The last 2L was a total ***** the car was cold and the oil wasn't as tin and I had to pump what felt like a hundred times as it felt like it was sucking in air and oil, because the hose wasn't thick enough to seal around the dipstick tube even though i used the second biggest hose, as the thickest hose connected to the mity vac.

Thank you everyone for the help! and all the tips!

dennish

I'm wondering if you got one of the defective ones like me. (defective top seal and/or valve) Shouldn't have to pump your brains out. Should evacuate with around 10 pumps initially and maybe a few more later on.

edgalang

I haven't gone to look at my 7201...but if someone can take a pic of the adapter that would fit on the dipstick tube itself I would greatly appreciate it. I have doubts I have that said adapter.

MB Marko

i don't know it just sounded like when you suck threw a straw at the bottom of your drink. lots of air and that kept the flow from continuing to come out. I had to eventually keep pumping to get the rest of the oil out but i did get 7L out.

MB Marko

its just the small rubber piece to connect the hoses together, I just went to see if it would fit and it takes some force but it seals it tight.

MB Marko

Did you have to return the whole unit where you bough it, I bought mine from Car Quest. I'm just trying to think what my next step is.

michail71

As a thought experiment it seems to me like a smaller diameter hose would be better at getting a full extraction. Once the level drops low enough for air to hit the dipstick tube the vacuum will just pull the air through at that point. Unless there was a bend at the bottom of the dipstick tube to help form an airlock. I'm just not sure how that attaches to the pan.

Either way it will still be a rather small quantity that gets left behind.

MB Marko

I did try both hoses, they both seemed like they just sucked more air until i was continually pumping. I did not know what the issue was so I just pumped until all the oil was out.

michail71

I had some issues with my last quart of oil too. I had to keep pumping at the end.

dennish

I called the 800 CS number in the booklet that came with the unit. I was told that if you can hear air at the side valve, then it's is defective. Mine was. They sent me a new valve. I also asked for a new top seal since these are also sometimes defective. I bought mine at Tooltopia.com. Had I bought locally, I would have just brought it back. Changing the side valve can be a little fiddly.

MB Marko

Before i started i tightened all the screws i really didn't even try to hear if anything was leaking. It just heard the sound of air and oil sucking threw a straw basically the whole time. Ill give them a call tomorrow and see what they think. It sounded like it was coming from the dip stick it self but ill see what they think.

michail71

It probably was and through the oil cap opening. With the vacuum air has to enter through atmosphere to help push the oil through. If the bottom of the hose makes contact with air it will start pulling mostly air instead of oil and vacuum will be quickly lost. There gets to be a point where you can't draw any more as the top of the oil level must be above the hose opening.

Also, once the system becomes full there is less volume of vacuum to help suction out the last bits.