What kind and how much diff fluid.

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Mar 18, 2008
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Two questions. I have a very small leak of oil on my right lock out. Is this normal?

Also, How many quarts of oil does the diff's take and what kind should I buy?
 
Sounds like one of your seals has gone bad. Rebuild the knuckle while you at it and put in Marlins oil seals (marlincrawler.com).

If you just want to top it off then fill it up with 90w diff fluid to the level of the fill plug on level ground. Don't waste money on synthetics.

I run full syn in my FZJ80 but regular dino in the 40.

Hope that helps.
 
Two questions. I have a very small leak of oil on my right lock out. Is this normal?

Also, How many quarts of oil does the diff's take and what kind should I buy?

If a "lock out" is a "free-wheeling hub", and the leak is small - I wouldn't worry about it.

The owner's manual for my 40 says the front diff on all models takes 2.5 liter (2.2 Imp qt) of API GL-4 SAE90 oil.

(But I think the oil I use is a multigrade - something like "80W-90 API GL5")

:cheers:
 
Oil should not be coming from the lockout. Rebuild the hub ASAP!!
 
Oil should not be coming from the lockout. Rebuild the hub ASAP!!

Fair enough. - I was just assuming it was a bit of "black gunge" that was marking an otherwise-clean wheel.

If oil is dripping from there - Then I agree with the others that it shouldn't be. The hub area should contain grease rather than oil. And if oil is there, then I agree that the seal inside the axle housing must be damaged allowing diff oil to enter the swivel housing.

But having said this, I would expect the oil-dripping problem to be coming from that big wiper-seal (on the other side of the hub) rather than from the freewheeling-hub.

:cheers:
 
I always thought that the symptoms of a bad inner axle seal included gear oil leaking onto the inside of the wheel.
Are your only indications on the outer hub?
That seems like a long way for the oil to travel to me.

With that being said, a knuckle rebuild kit can be had for less than $100. And if your going to get into the hub, it's not that much more work to do the whole knuckle.

Just my .02
 
And if oil is leaking out, then water will be getting in....
 

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