I changed out the factory fill oil and filter on my 2021 F Type R yesterday. It was my first time with a car that allows extraction out of the top and a top mounted cannister filter. The automakers should have come up with that method decades ago. It was a pleasure compared to pulling the car up on ramps, removing a bunch of fasteners on an underbody panel and then pulling a drain plug and screw on filter.

Question: I had viewed several YouTube videos on the Mityvac. When I used mine, I gave it about a dozen pumps to get the oil flowing but it would only drain about a half quart and then stop. I would pump it again, it would siphon up some oil and then stop again. I eventually got all the oil oil. But isn't it supposed to start the oil flowing and not stop until the sump is about empty ?

I must have had to give it a bunch more pumps at least a dozen times. I'm pretty sure that I pushed the plastic tube all the way down on the extraction tube under the filler cap and the tube was tight where it goes into the pump. The oil was pretty warm but not scalding.

 

I originally had the hand pump version and yes it's typical that it needs a few top up pumps. I don't think it's airtight so you may need to add extra but as long as the oil is flowing you should be fine. I upgraded to the one connects to an air line and I guess uses the venturi effect to create a suction - I noticed that the oil doesn't come out always in a continuous stream, sometimes there are some bubbles but all of it came out based on volume recovered. As you say, what a civilized way to fo an oil change and the filter on top that doesn't spew oil all over the engine block is good too....

 

I do not have this issue with my Mityvac. a dozen or so pumps is enough to pull several quarts at a time, I do give it a dozen more pumps half way through to make sure it's got enough vacuum to pull the remaining oil but it certainly does not stop only after half quart. maybe your mityvac has some sort of air leak?

 

Should you use the small plastic tube going all the way down inside the metal tube or just hook up the rubber tip to the top of the metal tube?

 

I've always had to use vacuum, rather than a siphon effect, to get the oil out. So, exactly as you describe, a number of pumps per qt. It might not siphon, because if the MityVac had a perfect seal, it would go from a vacuum (sucking the oil) to pressurized, which would resist siphoning. Mine isn't a tight enough seal anyway for siphoning, which would require pretty much a perfect seal between the plastic tube and the oil extraction pipe.

My 2 cents, anyway.

 

Listen carefully for leaks from the Mityvac. It's losing vacuum somewhere. Mine needed a little oil here and there to get a perfect seal.

It's natural for the vacuum to diminish as it fills with oil, that's just physics - but after less than a quart means a leak.

 

I too have had issues with the Mityvac. I switched to this one that uses compressed air to maintain a vacuum.


it is a huge improvement over the Mityvac

Another note is the oil should be hot, It flows a lot faster that warm oil

 

I've never had this issue with mine. I normally have to do a 5-6 pumps to get the oil to start to flow (manually) and then every so often pump once to keep it going. I just connect the small plastic tube to the metal tube inside the oil cap. Perhaps you have a leak of some sort, as others have suggested.

 

I'm thinking it may have an air leak. But at least it worked. I pumped it until it wouldn't suck any more oil out of the sump and got a little more than 6.25 liters out according to the graduations on the side of the Mityvac. I'll be more careful next time I use it that the tube is snug on the engine and also where it connects to the Mityvac and see if it improves.

 

I purchased a small electric pump on AMAZ for $16. Clean, Fast and efficient. Came with clear plastic hoses and connectors.
Off topic, please excuse....

 

Make sure the open-close valve is open all the way.

 

A lot of that depends on the oil temperature. There is a sweet spot between too cold and too hot. I find the Mityvac too small and use an oil extractor as they are now very common. Still use the Mityvac for lots of other stuff though.

I use a Schwaben 6L dual powered extractor. Hand pump or use a compressed air connection to really apply vacuum. About $95.
6L Oil Extractor
.
.
.

 

That looks like a nice extractor too, but what do you do when the sump in the Jaguar holds more than 6 liters ? Stop, empty some oil and then remove the rest ? The stated capacity of the V8 in an AWD model is 6.5 liters/6.9 qts with a filter change and I removed a little more than 6.25 liters, maybe more like 6 1/3 liters on my last oil & filter change.

 

That is why I use this one as it holds 9 liters.

 

Yes I dump it. Again it's a trade off. They make small ones which are easier to handle and get into tight spots. Mine has a number of different tubes and they all fit inside one another. So I can put the vacuum extractor 10' away and using compressed air means I don't have to stand over the extractor and pump it. With the AWD stuff I have it's a very torturous path to get to the fill plugs on the transfer case and rear end. So I have various rubber hoses to get into places.

Now the Jag is a dream because everything is on top of the motor and very easy to get to.

My only complaint is the tank is not to be disassembled so flushing the reservoir out is a bit of a pain. Of course it's all waste fluids but I like to inspect all fluids before dumping them.
.
.
.

 

If one had the desire to clean the cannister on a Mityvac or similar device, would a good method be to pour a quart of odorless mineral spirits in it, slosh it around and then drain it ? And maybe pump a little through the hose to clean the pump valve components ?

 

I use degreaser.

 

5 or 6 pumps to get it started, maybe a couple of more half way through and it's done in under 10 minutes. Suspect you have a leak somewhere.

 

Yes I just put some cleaner in the tank and agitate it around and dump out. Carb cleaner, thinner really anything will work.
.
.
.

 

The one I use has a 7 liter capacity. Made by Trac. Never had any issues with it extracting oil from my boat or cars.