Letting Oil Drain Overnight

[Malo83]

Once the oil starts draining and the second brewskie is done, time to refill.

 

[CR94]

The pump won't necessarily "cavitate", but in some rare case the pump may lose it's prime and oil pressure may not happen for too long of a time until it re-primes itself. I've never had it happen because oil pressure builds just as fast after an oil change regardless if the oil drained 30 minutes or 24 hours on all the vehicles I've let the oil drain for a long time. Most pumps seem to be tight enough that the oil inside them doesn't drain out even if the the sump is drained for a very long time.

Some people here are conflating oil pump "cavitation" (which is highly improbable in this context) with loss of prime. My brother had a VW on which loss of pump prime seemed to be a problem following an oil change, especially if the new filter was one with a sticky ADV.

 

[levi]

Once the oil starts draining and the second brewskie is done, time to refill.
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Brilliant. Cheers.

 

[ammolab]

Waiting hours and hours or overnight also gives the oil on the bearings and lifters the maximum time to drain out so they have the minimum amount of oil left on them for that 5-6 seconds of zero oil pressure after an oil change.

As a general rule, I'll take old oil over no oil every time.

Doesn’t your car sit overnight with the oil draining off the lifters and bearings EVERY NIGHT? Maybe multiple nights? Then the oil change with overnight drain is just like any other lifter and bearing lube situation.

 

[John105]

As a child, I did ask my dad if we could let the oil drain overnight to really get all of it out. My dad actually respected the ideas of his little big man.

Unfortunately, it was a Sunday and so it didn’t go so well, as I lay sleeping, and as he backed the car out to go to work that next morning

 

[Greasymechtech]

Once the oil starts draining and the second brewskie is done, time to refill.
View attachment 158102

That's a great system right there

 

[TiGeo]

Once the oil starts draining and the second brewskie is done, time to refill.
View attachment 158102

This stuff is pretty decent actually for just a basic light beer.

 

[JeffKeryk]

I run a quart of the cheapest 10 weight I can find to flush the bottom of the oil pan..

I hear tell M1 works better...

 

[JeffKeryk]

Well, oil changes used to be a religious experience for me. Now I love my MityVac and every-other-service (or 3) filter swaps...
Sometimes I don't even have to warsh my hands...

 

[Jesse_NE]

I don't take any chances and rebuild the motor so all the old engine oil is completely removed.

 

[Zee09]

It's best to run 3 quarts low and then change the oil. This way the contaminates are highly condensed allowing for easier as well as complete removal.

 

[Ihatetochangeoil]

Doesn’t your car sit overnight with the oil draining off the lifters and bearings EVERY NIGHT? Maybe multiple nights? Then the oil change with overnight drain is just like any other lifter and bearing lube situation.

You're going to end up in BITOG purgatory talking that way. Common sense DOES NOT apply here.

 

[BornSlippy]

I just get the garden hose out and stick it into the oil fill hole and give it a good rinse.

 

[garageman402]

When that dirty oil has drained and only dripping - pour a few ounces of clean oil in - and watch how fast clean oil comes out …
Think about that …

You know, I did that this morning after letting it drain all night! I did have a shop towel in the drain hole because it was outside & I didn’t want dust blowing inside. Usually the oil will seep through the towel. I pulled the towel out and more oil drained out, I then put about 8oz clean oil in, the clean oil came out immediately but as the flow slowed it got dirtier, so it was mixing with the dirty oil left behind.

 

[garageman402]

The pump won't necessarily "cavitate", but in some rare case the pump may lose its prime and oil pressure may not happen for too long of a time until it re-primes itself. I've never had it happen because oil pressure builds just as fast after an oil change regardless if the oil drained 30 minutes or 24 hours on all the vehicles I've let the oil drain for a long time. Most pumps seem to be tight enough that the oil inside them doesn't drain out even if the the sump is drained for a very long time.

I thought the pump was submerged in oil, so it would be “primed” whenever oil is present. Once the filter is removed & air is allowed in the galley, can oil drain out of the pump?

 

[ZeeOSix]

I thought the pump was submerged in oil, so it would be “primed” whenever oil is present. Once the filter is removed & air is allowed in the galley, can oil drain out of the pump?

Oil pumps are not submerged in oil ... but the pick-up tube that feeds the pump is. When the sump is drained, the oil in the pick-up tube up to the pump itself will most likely also drain out. In most cases, I don't think the oil that is inside the pump drains out, because the fit of the rotor tips to the pump housing is usually pretty tight and will retain the oil that's captured inside the pump. It's possible if a pump was worn or the clearances were loose that it could drain out and lose its prime. In all the vehicles I've change oil on, I've never seen any indication that the pump lost its prime, and oil pressure builds up pretty quickly for a sump dump.

 

[garageman402]

Obviously you want a good drain, you want to do it hot, oil dipstick up, you also supposed to remove the oil filter, before putting the drain plug back in, because sometimes more oil will come out of the sump, never seen that happen.. I've done thousands upon thousands of oil changes in my career.. and probably then some LOL

I have seen that happen. Removing the filter allows air into the galley so more oil drains out. Where it comes from I don’t know, back drain through the pump?

Dipstick up (or cap off) I believe is unnecessary, there are plenty of ways for air to ingress into the crankcase.

 

[ZeeOSix]

I have seen that happen. Removing the filter allows air into the galley so more oil drains out. Where it comes from I don’t know, back drain through the pump?

The oil drains out of the galleries that are above the oil filter. The same oil galleries that the filter's ADBV prevents from draining down when the filter is installed and the engine shut off.

 

[Ursatdx]

I use every last drop in the 1 gallon plastic container our milk comes in.
It sometimes takes near an hour to get that very last drop.
The last drop is always used to fall on one of that last dry flakes of cereal.
Stinks because a majority of the other flakes are, now, soggy.
It's important because it's the right thing to do, no?

God Bless America!
For those who gave all.

 

[4WD]

Once the oil starts draining and the second brewskie is done, time to refill.
View attachment 158102

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