Harm in Shaking the Oil, Getting Air Bubbles?

[theedge67]

I recently had a problem with my PP having some slime looking deposits on the bottom of the quart containers. I checked my stash of freebie Q (in the clear plastic bottles) and noticed similar deposits through the plastic. I decided to shake vigorously for about 2 minutes, and the deposits were gone. The problem was the oil was a haze of micro air bubbles. I let it sit for 5 minutes, and was better...but still hazy.

Question: could this trapped air cause problems with the oil. Also, would it be bad to change oil with this right after shaking, and start the engine before the oil can settle?

I'm wondering because it may take 30+ minutes to completely settle out.

 

[lindermant]

it can't be any worse than when the oil gets flung around inside the engine while running, can it? I say don't worry about it...

 

[OilGuy]

No problems, I wouldn't worry about pouring oil with bubbles.

I don't know how common that apparent additive dropout is though. At least it went back into solution - for now.

 

[alreadygone]

Anyone with any clue what actually happen when you START that engine's gotta be rollin' in the floor over this one!!

Bob

 

[theedge67]

That is sort of the question...what will happen??

 

[derek244]

Nothing will happen. That is one thing the oil has is anti-foaming agents.

 

[TallPaul]

I would guess any air bubbles remaining would be squeezed out the first time that oil goes through the oil pump, if not there, then the filter, and for sure the bearings.

How hard are you shaking this oil? You didn't put it in a paint shaker, did you?

 

[theedge67]

I did have to shake it very vigorously for about 2-3 minutes to get the stuff to dissolve. Gentle shaking wasn't doing it. I figured if the stuff (whatever it was)was in the oil to begin with, it should be in the oil when I pour it into the engine.

 

[Dad2leia]

After reading some of the VOA's posts about that stuff at the bottom, and the comments in the VOA sheeet itself, I've started shaking (although not very hard) every bottle of oil that I pour into a crankcase now.

 

[AEHaas]

"Nothing will happen. That is one thing the oil has is anti-foaming agents. "

A New Method of Measuring Aeration and Deaeration of Fluids, Morgan et al:
Air in oil causes oxidation, wasted power, higher oil temperatures, loss of lubricity among other adverse effects. Higher RPM increases aeration, so does increasing oil viscosity.

Oil rapidly gets air mixed into it. As said above, there are additives to minimize the effects. Shaking the bottle has no adverse effects. The positive effect is to re mix the additives, some of which seem to settle over time. I always shake my bottles for 30 seconds or so before putting the stuff into my engines.

aehaas

 

[derek244]

Quote:

---

"Nothing will happen. That is one thing the oil has is anti-foaming agents. "

A New Method of Measuring Aeration and Deaeration of Fluids, Morgan et al:
Air in oil causes oxidation, wasted power, higher oil temperatures, loss of lubricity among other adverse effects. Higher RPM increases aeration, so does increasing oil viscosity.

Oil rapidly gets air mixed into it. As said above, there are additives to minimize the effects. Shaking the bottle has no adverse effects. The positive effect is to re mix the additives, some of which seem to settle over time. I always shake my bottles for 30 seconds or so before putting the stuff into my engines.

aehaas

---

Whew, I started second guessing myself about engine oil and ATF and the anti-foaming agents. I feel better now sir.

 

[pcoxe]

This could also be a reason why lighter oils might be better in some applications - bubbles can float out faster. Thicker oils may have a higher film strength initially, but not so much if they have foam fluffed up in them.