Suction Oil Change

[GH85Carrera]

I have heard of commercial oil change places doing it that way. For the average commuter soccer mom vehicle it is a time saver.

I personally would never do it on my old high mileage cars. I have magnetic oil drain bolts and I like to inspect them, and there is always a grey almost metallic goo on them. Never any chunks, just the pencil lead like coating.

I have done will over 100 oil changes on the trusty El Camino, and lots on the 911. It is pretty easy.

[jyl]

Originally Posted by Chocaholic

Which W124 do you have? I have a 95 E320 Cab (A124) as my daily driver.

1994 E320 sedan

[FPB111]

Some food for thought.
2012 - 16 991 Porsche no dipstick.
Engine fill after rebuilding = 12+ qts
Oil change = 7-8 qts. 4+ qts left in engine with recommended 15k changes? Not in my 911.

[jyl]

It seems like cars got all weird with oil change starting about 20 years ago? My W211 (almost 20 years old) doesn’t have a dipstick. You use the computer to check the oil level. Also no dipstick for transmission fluid level.

[Scott Douglas]

Just thought I'd report that I used my Mityvac today to alleviate a potential flooding situation in our back yard. Took about 6-7 tankfuls to 'drain the swamp' that was up against the house. Worked well and I may just do my next oil changes with it too.

[Jeff Hail]

Suction oil changes? Brings back memories of the first time I sucked (syphoned) gas.

[stomachmonkey]

Great thread thank you.

Need to pick up one of these for the Jag and was not sure which to get so I appreciate all the input here.

[monoflo]

But i still gotta get under there for the filter ---so sorta defeats the purpose.
Luv the idea though.

[monoflo]

the getting under part

Obviously not any older 911

[Jeff Higgins]

Maybe I'm old fashioned, but this sounds at least a bit sketchy to me. I always figured that no matter how fast I get to the drain plug after driving around and warming up the motor, whatever particulates are suspended in the oil will already have begun to settle. The vortex created when it drains out a hole in the bottom at least partially stirs things up and re-suspends those particulates, so they can drain. At least that's the mental image I've conjured up for myself. Could be completely wrong, of course. Maybe the sucking up through a tube does the same thing.

[stevej37]

I will pass on it.

[Jeff Alton]

We have the equipment to sunction out the oil. And many MB dealers do just that. We don't, drain is the most correct way...

Plus, in a shop environment, it is pretty hard to inspect a clients vehicle while it is sitting on the ground and not in the air....

Cheers

[Bill Douglas]

My thoughts are much the same as Jeff's. I'm fully prep'ed up, correct socket, drain pan ready. Bring the 911 in with the oil warmed up (and a last high rev sprint down the road). Onto the scissor lift and out it comes.

Mind you I never bother with the sump plate. It doesn't have a drain hole and there is only a cup full at the most in there (on my 1982 SC engine), so I leave that.

[sc_rufctr]

Yep super convenient but you have to buy the vacuum pump & they're not cheap.

- I already have the spanners

[GothingNC]

I use the Pela oil extractor on my VW TDI.
Canister filter is on top, makes it super easy.

[GH85Carrera]

Originally Posted by Bill Douglas

My thoughts are much the same as Jeff's. I'm fully prep'ed up, correct socket, drain pan ready. Bring the 911 in with the oil warmed up (and a last high rev sprint down the road). Onto the scissor lift and out it comes.

Mind you I never bother with the sump plate. It doesn't have a drain hole and there is only a cup full at the most in there (on my 1982 SC engine), so I leave that.

My 85 Carrera has no sump plate, but it does have a drain plug. I usually get two or so quarts from the engine. Again, with a magnetic plug, I like to see the magnet and inspect and clean it.

If I had an appliance like car, that was not something I was going to keep, yea the suction method would be fine.

[911_Dude]

Some of you guys sound like you have a handful of sand floating around in your motor oil. For anyone that takes reasonable care of their motor I doubt there are any particulates settling after the oil runs through a 20 micron oil filter. If you like to look at your mag plug, I can relate. But hurrying to drain the oil after warming up the engine so the sand doesn't settle- not so much. But to each their own.

[Por_sha911]

Its been my opinion that the last 1/4-1/8 qt of oil draining out is going to have the greatest concentration of particulates. Why not get the most out possible?
Also, to change the oil and not the filter is a waste of time and since the filter is underneath, I have to jack up the car anyway.

[Sawyer911]

On the 911SC's how much oil is left in the lines going up front to the cooler?

My wife had always used the dealer (coupons lessen the pain) they always use the top suction method. I was told the oil pans have a low spot to suck from. To use the drain plug there are the mid and front bottom panels to remove as well.

I just bought a manual 2.3 gallon suction set up and will try it out next time for a change. Still got to watch it as the oil change is 8.5 quarts.

Everything else I climb under as a good practice for addtional inspections.

Sawyer

[fanaudical]

Well, I pretty much have to go the suction method for an oil change on my wife's Q3. The entire bottom of the engine is covered in a bunch of aero panels and access to the drain plug is still difficult if you remove them (at least according to the pics I've looked at). Filter is on the top-side of the motor too.

I still pull drain plugs on the truck and the 911.