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#2111537 - 12/20/10 10:04 AM Rear Differential Oil Foamy/aerated
madibob Offline


Registered: 04/24/09
Posts: 119
Loc: Minnesota
Yesterday I checked the rear differential fluid in my Tacoma. When I pulled the plug, the oil seemed pretty foamy/frothy/aerated. I had just drive the truck about 5 miles on the highway prior to pulling the plug, so it wasn't sitting very long. I checked it this morning without having driven in and it was normal without all the bubbles in it. Does this seem like a problem? Doesn't seem right to me and has me a little worried. I would think there should be no air bubbles in it.
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2002 Toyota Tacoma 3.4L 4X4
2000 Ford F350 7.3L

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#2111542 - 12/20/10 10:11 AM Re: Rear Differential Oil Foamy/aerated [Re: madibob]
Steve S Offline


Registered: 01/20/03
Posts: 18449
Loc: East of IGO
There is going to be bubbles. The oil is whipped up by the gears turning in the oil.
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Why do people post I want the best for my car,,, When there isn't anything that is the best on the car to begin with.

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#2111554 - 12/20/10 10:16 AM Re: Rear Differential Oil Foamy/aerated [Re: madibob]
tinmanSC Offline


Registered: 09/07/10
Posts: 2222
Loc: Oswego, IL
It's normal. Gear oil can be whipped up by the gears pretty fast. There are some videos on youtube of people who have put on clear differential cases. You can see it directly. The oil starts out fine, and within a minute it looks like a frothy milkshake. This is normal. There are anti-foam additives in GL-4/5 to keep it from getting out of control.
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#2111564 - 12/20/10 10:21 AM Re: Rear Differential Oil Foamy/aerated [Re: Steve S]
d00df00d Offline


Registered: 10/20/05
Posts: 10376
Loc: PA
Originally Posted By: Steve S
There is going to be bubbles. The oil is whipped up by the gears turning in the oil.

Exactly.

Some oils trap more or less air than others, but some aeration is completely normal.
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#2111633 - 12/20/10 11:22 AM Re: Rear Differential Oil Foamy/aerated [Re: madibob]
madibob Offline


Registered: 04/24/09
Posts: 119
Loc: Minnesota
Thanks for the responses. Looks like I'm OK.
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2002 Toyota Tacoma 3.4L 4X4
2000 Ford F350 7.3L

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#2111732 - 12/20/10 12:25 PM Re: Rear Differential Oil Foamy/aerated [Re: madibob]
EricF Offline


Registered: 07/14/09
Posts: 1640
Loc: SF Bay Area
Is it the same reason the lucas oil stabilizer gets frothy?
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1993 Ford Ranger XLT 4.0L 4x4 (240k) 5W-30 Synpower
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