I just serviced my Nismo diff with the left-over Motul that I bought from Sharif@Forged 4000 miles ago (what a great vendor BTW!!!). The specs say that our diff holds 3 pints of oil, but I probably put in almost 4 pints (I pretty much finished one almost-full bottle which is ~2 Liters). Is too much LSD oil a bad thing? Obviously, too little is very bad.

 

won't it leak out the breather?

I thought you were basically supposed to fill it until it started leaking out of the fill-hole, and as long as the car is level you can't go wrong.

(correct me if wrong Kthnxsbye)

 

/\ That's correct.

 

if you jacked your car up from the back and it was leaning forward, I guess it is possible to overfill it a little, butI can't imagine a whole pint extra.

maybe the bottle had less than you thought in it?

 

how often do you change yours anyhow?

 

start with a level surface and keep filling until it dribbles out the fill hole.

 

How do you put too much oil in the deferential? There is a hole in the side.

 

deferential? I don't bow to mine

also, with the Nismo LSD, I change it when I change my engine oil. 3k-4k miles.

 

I used to overfill my old welded diffs, and those were well over 15 years old and it was fine. Any excess pressure is released from the breather

 

Yeah, I had my car jacked up from the rear on the passenger side, so that makes the fill hole on the side higher. I'll see if there is anything I can do about opening up the fill plug and leveling it out.
This is the fifth time I changed my diff oil. I wait about 3-5K miles.

BTW, what is the "breather"?

 

It equalizes the inside diff pressure to the pressure outside of the diff.

 

it's on the top of the diff. you should see a line of fluid residue on the casing coming from the top (in the back)... just follow it up. I think it's just a hole with a valve.

 

Thanks Motormouth, I'll take a look.
So I guess the answer then is a unanimous "No, too much LSD oil is not bad."

Thanks, everyone!