first post, quick question

[wvcvpi2003]

hey im new here, i have a question for ya'll.

when changing your oil and it has all drained out, would it be a good idea to pour a quart of fresh oil through the motor slowly to sort of flush out remaining deposits?

i figure supertech is cheap enough that sacrificing one quart of it before filling up with Pennzoil conventional.

 

[JOD]

I've done that with a differential before, one that had 60K on the fluid... Don't know if it helped but it made me feel better.

If your oil has been in there for 30-40K, it may not be a bad idea! My honest thoughts are that if that quart of oil is flushing out any additional contaminants, you've good much bigger issues which need addressed.

Short answer: don't worry about it.

 

[cp3]

I was doing this but just enough that it ran out the bottom as clear as it went in, usually didn't even take a whole liter. I'm not sure in the grand scheme of things it really does much but wast a bit of oil.

I think it's more important that it's changed!

 

[exranger06]

Waste of time and oil IMO. It doesn't matter how many quarts you use to "flush" it, there will always be some residual oil in there. For example: If you have a V6 or V8 with the oil cap on one of the valve covers, the oil will flow from the cylinder head down to the oil pan, but it won't get anywhere near the other valve cover or cylinder head.

 

[pbm]

Waste of oil, IMO.

 

[bluestream]

Complete waste of oil and money. Most likely the oil you drained into the pan was still good also. No way to know without a used oil analysis.

What about the 1-1.5 quarts of oil left in the oil pump, oil galleries, and lifters? How will you get that out?

 

[simple_gifts]

Originally Posted By: pbm
Waste of oil, IMO.


+1; the oil in there was doing a fine job 5 minutes earlier so......

 

[Scienceman]

I don't do it anymore.
I just try to be patient and let it all drain out well.

 

[cp3]

Originally Posted By: Bluestream
Complete waste of oil and money. Most likely the oil you drained into the pan was still good also. No way to know without a used oil analysis.

What about the 1-1.5 quarts of oil left in the oil pump, oil galleries, and lifters? How will you get that out?



I have read about a solution for this! Someone posted, I can't remember where, that they would run the engine until the last of the oil drained out of the pan, then shut the engine off a few seconds later!!

No, I have not done this, just sharing the story...AND NO I AM NOT RECOMMENDING THIS!!!

 

[Ken2]

The only time it is necessary to flush the oil system is if someone contaminated it...something like pouring antifreeze into the oil fill instead of the radiator fill. In this case it would be drain, fill, run, drain, fill, run, drain, fill, run, etc.

There are too many nooks & crannies inside the engine that hold a bit of old oil. Many engines go 300,000 miles with just ordinary care. Don't worry.

 

[mechtech2]

wvc -
That type of flush is not going to do anything, except waste oil, your money, and your time.

If you filled it with oil like normal and ran it for a while, then maybe .

BTW, Supertech is a pretty good engine oil.

 

[CATERHAM]

Originally Posted By: wvcvpi2003
hey im new here, i have a question for ya'll.

when changing your oil and it has all drained out, would it be a good idea to pour a quart of fresh oil through the motor slowly to sort of flush out remaining deposits?

i figure supertech is cheap enough that sacrificing one quart of it before filling up with Pennzoil conventional.


First, welcome.

As alluded to by others, that won't do anything since the oil is not being circulated without running the engine.

Even if you reinstall the drain plug and new oil filter then add just enough fresh oil to cover the oil pick-up; say one quart (it helps to have an oil pressure gauge to make sure you've added enough oil), then idle the engine for a couple of minutes, and then drain it again; you'll freshen up the pint or so of oil that remains in an engine after draining but that's all you'll accomplish.

Modern, high detergent motor oils hold what would be "deposits" in suspension, and as long as you change the oil frequently enough, deposits will not be a problem.

 

[901Memphis]

Just go all out and buy a whole jug of Pennzoil Conventional and grab some seafoam or mmo and run it in there for a couple days and drain it out!

 

[Shannow]

There was an old Mobil FAQ when FAQs were in magazines and there was no internet that suggested that before changing to synthetics, a very short OCI on new Dino was just as, if not more effective than short changing the synthetic.

Your idea has been discussed before (no I won't PM you know who), but depends a lot on where the drain from the head goes, where the oil hides out etc.

My old Toranas would have been usefull, but I never did it.

Some reckon an air hose stirs things up enough to get extra oil out.