How much oil can a dipstick pump get?

This seems lazy and a good way to leave metal fragments in your oil pan. Drain process helps clear all the junk out. I would advise against this personally. Change your oil like a normal person.
 
on some vehicles the extractors can actually get more oil and sludge than the drain plug due to the pan design, someone will have to be the guinea pea and test (i would but i don't have my extractor any more)
 
Assuming that the dipstick tube location allows you to get the extractor hose to the lowest part of the pan, you should be able to get virtually all of the oil out.

Done this many times on boats (it's pretty much the only way to do an oil change on most inboard engines).

-Spot
 
on some vehicles the extractors can actually get more oil and sludge than the drain plug due to the pan design, someone will have to be the guinea pea and test (i would but i don't have my extractor any more)

Assuming that the dipstick tube location allows you to get the extractor hose to the lowest part of the pan, you should be able to get virtually all of the oil out.

Done this many times on boats (it's pretty much the only way to do an oil change on most inboard engines).

-Spot

The 1GR-FE has a dry sump oil system. I'm no engineer but I don't think you are gonna get to all the oil out of all those nooks.

Edit: This is wrong I'm pretty sure. I doubt we have a dry sump system.
 
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You could always suck out all of the oil then use a thin metal rod like a coat hanger via the dipstick tube to touch the bottom of the pan to measure what is left. The stock dipstick may not reach all the way to the bottom of the oil pan. You would only have to do this the first time you snorkeled out the oil.
 
Dry sump? I could be wrong, but I don't think that's the case.

So could I I was just looking at the oil pan pics online and was making assumptions. On second thought I kinda doubt it actually they are not very common on street cars. Kinda race completion thing. Nvm

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I thought of another point -- some of the oil suction kits come with a plastic suction tube that you insert into your dipstick tube that allows you to be sure that you have reached the very bottom of your oil pan.

I've had a hand powered oil suction pump for about 30 years and used it for more oil changes than I can count. Once you get the oil flow started you can remove the pump and just syphon the warm waste oil into a container.

As someone stated earlier -- sucking the oil out of marine engines is common practice and most marine engines work much harder than automotive engines and really do need clean lubrication.
 
I have a earlier version of the Griots pump shown in post #19, but do not use it to siphon oil.

I bought it to siphon transmission fluid thru a dipstick for an Asian SUV I once owned that had no transmission pan drain plug.

This device is also handy for siphoning power steering fluid and brake fluid. Both of these fluids will destroy a turkey baster or the ones like a turkey baster sold at auto parts stores after a couple of uses.

I've had this thing for approx. 10 yrs. and it works as well now as it ever has.
 

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