Allowing oil to drain a long time question

Pennzoil motor oil
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The reason to change as much oil as possibe is to get as much new oil in as possible. Change while the oil is hot, believe what is said about oil filters catching the crud, and just know that you will never get it all out, and you don't need to!
There's an Amsoil dealer that touts he has never changed his oil. He gets away with this because he pulls a sample monthly. This replaces enough of his old oil to allow the new oil with it's add pack to make a difference. That and a bypass oil filter system that he changes out annually with the couple of quarts replaced in the cannisters.
The point I'm making is this: You can either change out your oil all at once or a small bit at a time. The results will be the same. You can either get 80% or 90% of the old oil out and the results will end up being the same as long as your next oil change happens before all the additives are used up and all the contaminants don't get to a level too high.
Sometimes anal people can scratch too long. Ask me how I know?
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I assume by full you mean adding oil, running the engine, checking the level and then adding to full if needed?
 
I have a friend that dumps in 4 quarts and never checks his level. His motor is still running great but I've checked his dipstick before and he is always running a half quart under the line.
 
some people are more concerned about it and more religious when it comes to car maintenance and upkeep.

I am going to do an oil change this weekend for my girlfriend in her explorer, change air filter, gonna siphon/refill ps resevoir, eventually drain/refill radiator.
 
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Does it really matter to get the last drips out? If you only drain 4.5 qts of a 5 qt system, then fill with 4.5 qts fresh oil, you will have 10% old oil. Mix it all together and it should be roughly the same as if you had 100% new oil and were 10% of the way into your OCI, right? Which means that 90% of the time your oil is dirtier than that, so what is the big worry to get that last bit out?

Now if you suspect extra nasties are present, then a Patman flush is better than the extended drip down.
 
Hmmmmm - it always happens that I'm out driving... then suddenly remember that oil change is due. Get home, shut off engine and immediately drain oil/remove filter. Wait 30 minutes then finish the job. Seriously - I always change it just after it's been driven..... with the thought that the hot oil drains better and maybe has more "stuff" suspended in it.

Well, it couldn't hurt, right?

Probably doesn't make any difference. Just one man's routine.
 
is how i do it basically too, i let it sit about 30 minutes to an hour to cool a little then start the "procedure"
 
The humor here is that most of the stuff BITOGers are draining out is in better shape than 90% of the oil being run by the general population.
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Originally Posted By: SevenBizzos
I don't think there's too much of advantage of waiting longer than when it starts to slowly drip. You've already drained 99.8% of it (that would possibly drain out) to that point. The additional .2% isn't going to make a difference in the scheme of things...


This statement is nonsense. Please try to prove these numbers you state.

If you keep 1/2 of a quart in a 5 quart sump you are getting 10% left in the sump. I have found if you let it drip for about an hour, I get about 1/4 of a quart to come out. That is an additional 5% of the sump volume. Would you rather have 5% or 10% of the old oil left in your pan?

These numbers you state are just pulled out of your....well you know its [censored].
 
Originally Posted By: 02zx9r
is how i do it basically too, i let it sit about 30 minutes to an hour to cool a little then start the "procedure"


I let it drain while I go inside for a drink or check on the front sway bar bolt that suddenly stripped a year ago and gets loose now. The longer the oil filter and hot block that its attached to have to cool down, the easier it is for me to stick my hand into the hot, sharp and cramped space back there and try to loosen it without a wrench.
 
I am not fond of extended drain times. Who knows, the longer you wait, something could happen (you die, your forget, you get distracted, you get a call that a friend is in the hospital in critical condition), then you forget, leap in (or someone else leaps in) and take off, burning up the engine. I get really bad feelings when there is no oil in my engine. Once the stream stops, I cork it.
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I love to change it while its HOT! Put on a pair of surgical gloves to prevent too bad of a burn. Let er drip 30 mins, change the filter, put on new filter, fill er up.
Works for me.
 
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Leave it up to you TallPaul to sum it up in a way that tickles the cockles of my heart!!!

With the valve trains designed the way they are these days, you could let it drain for a week, and not get out over 98% of the oil up there. Gravity works in one direction...down. Not around sitting in the little cavity that doesn't have a passage to drain down from.
 
I gotta laugh. We BITOGers wring our hands over the most insignifigant things! Ever wonder what a BITOG convention would look like?
Makes me shudder to think that I would actually look forward to the seminars!
OK, here goes for some of the seminar titles:
When has a drip dripped enough?
How to modify a funnel for when it's windy outside.
Ethics of what to do with low mileage used oil.

Any others?
 
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