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From the obsessive compulsive department:

I've been changing my own oil by driving up on a pair of ramps, draining and filling. Based on a slight overfill condition after adding the specified amount of oil and returning the vehicle to level, I know I'm not getting all the old oil out. This makes sense, since the drain plug is towards the front of the oil pan. Oil must be pooling at the back of the pan due to the angle from the ramps. It can't be more than a couple or three ounces.

I'm not worried about the slight excess. Shaving a couple ounces off the amount added next time will put it spot on. I don't like the idea of leaving a measurable amount of dirty oil if I can avoid it, especially on the one vehicle that only gets out of the garage a few months a year.

I suppose I can try and get another pair of ramps under the rear wheels if they'll fit. Jacking up the rear to level the vehicle would work, too, I guess. Any other ideas? Am am I the only nut that worries about a couple ounces of dirty oil?

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I'm more worried about leaving the heaviest particles of junk sitting in the back of the oil pan, could be metal particles that you might want to learn about. A little extra dirty oil is one (minor?) thing, but heavy pieces of "stuff" is another. [old post, but got new answers today] – Xen2050 Jan 12 '15 at 13:55
What are you driving that requires you to drive up on ramps to get to the oil drain plug?? If it's too much of a hassle for you to crawl underneath yourself then you should just have a shop do it. It's usually only a few dollars more than doing it yourself and other people may say that proper fill levels aren't a huge deal but it really depends on the vehicle. If you have an engine with poor circulation by design in the heads (Ford 4.0 OHV for example) then you really can't afford to be running a few ounces low. You'll get to learn how to replace rocker arms. Its really a personal decision tho – Jhawins Feb 27 '15 at 19:27
@Jhawins It's a vehicle with minimal ground clearance. – Mark Johnson Jun 11 '15 at 23:37
@Xen2050 That's what magnets are for. – Mark Johnson Jun 11 '15 at 23:40
up vote 9 down vote accepted

For OCD you can place a flat pan below the oil drain and lower the front wheels to get the remaining oil out, then jack it up again.

Though I would not worry about couple of ounces in your place. Even if your car is level old oil will still remain in the engine (other cavities, thin film, etc.).

For example in my engine that takes 4L of fresh oil, 2 ounces is less than 1.5% of it.

In case you need to flush the old oil completely (e.g. after filling with wrong type of oil) you could use a oil flush mixture (drain old, refill with flusher, idle 5-10 min, drain, fill new oil).

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You'll never get all the oil out anyway - a lot of it is left coating the innards of the engine! I'll second the "don't worry about it" comments. – Nick C Apr 12 '12 at 10:25
To take Nicks comment a step further... My drains are on the back of the oil pan (on both cars), so it's the lowest point while jacked up in the front. Books says a wet fill should be 4.5qt. I only put in 4qt and they still both show 0.2-0.3 overfilled when I'm done... You're not going to get all the oil out no matter what you do! :-) – Brian Knoblauch Apr 12 '12 at 12:04

Use a pump to remove the oil, and skip the ramps -- unless needed for the filter. I can not imagine it makes any difference-- some oil is left no matter how well you drain. Use better oil or change more often are other answers. The oil gets dirty immediately anyway so I wouldn't want to do anything that could be unsafe like raising all 4 wheels -- just buy a good jack and stands and lower the car to the ground or go with the pump if it bothers you. I'd forget the "problem".

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You can get more oil out of the bottom if you take pan off once it's empty. The difficulty of doing this will vary by car, of course. Just be careful if the oil is hot. And you will probably need a new gasket for when you put it back on.

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This is completely unnecessary unless you've got contaminants such as sand in your oil, and then you'd need to tear apart a lot more than just the pan. – Kevin Vermeer Apr 17 '12 at 9:57
@Kevin Vermeer I know that. But it does answer the question of getting as much oil out as possible. Note, too, that some service manuals as recent as only 25 years ago still recommended doing this. – staticsan Apr 17 '12 at 23:39
Not an option in my case, unfortunately. Getting the oil pan off requires lifting the engine. – Mark Johnson Apr 23 '12 at 20:55

You don't need to worry about draining every last drop of oil. Just make sure that you change the oil and filter regularly every 50,000 miles as I do. My 4 cars perform as new with an average of 165,000 miles, 2 diesel and 2 gasoline.

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Every 50,000 miles? – Jason Hutchinson Dec 2 '15 at 17:13

Back the car up on the ramps so the rear wheels are up, if that allows the plug and filter to be accessible. Be sure to put good (not plastic) hocks on the front and test the integrity before you go under. Remember the weight is in the front and if your not on a completely level pavement it will roll off the ramps and then your bug food. Krona solution btw is the right one, but not really answers the question.

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don't to nothing with your car let it stand on a leveled place then open the bolt and drain it out or you can rise it up a little bit up form the behind and drain it out this will work.

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