[Pr335bob]

I'm about to change my rear diff fluid tomorrow . I've been researching and it seems like my 07 n54 rwd uses 75w-90 weight. My question is how much? I saw a diy where the person used 2 liters or at least he only showed the 2 I don't know if he used both completely.

Thanks guys!

[rooringhusky]

Uses slightly less than 2 liters. Castrol SAF-XO is the OEM stuff by the way. Best of luck!

[Pr335bob]

Thanks really appreciate it!

[Monster900]

Keep filling until oil will start coming out of filling hole. Try to suck as much of old fluid as possible before filling up with the fresh one.

[Pr335bob]

OK that makes it easier. I thought it was an exact amount. Or to be careful not to overfill. So basically fill until it overflows.

[ferocity02]

Is it possible to remove the diff cover and drain it that way? Seems like a better way to get all of the old oil out. Might need to replace a gasket but it couldn't cost that much.

[rooringhusky]

Originally Posted by ferocity02

Is it possible to remove the diff cover and drain it that way? Seems like a better way to get all of the old oil out. Might need to replace a gasket but it couldn't cost that much.

It would be easier to just do the drain and refill twice. Drive the car hard before draining is recommended as well. Either way best of luck!

[Big_CG]

Dont stress too much about getting every drop out. I just changed a e90 with 200k on it and the fluid was original and looked perfect.

Changed my 335 fluid with 100k on it and was perfect looking

Just suck whatever you can with a pump out and top it off with Redline 75w90 or the OEM XO fluid until it dribbles out when on flat ground

[Pr335bob]

Thanks again ! Gives me confidence . My main worry was the amount of fluid it needs.

Originally Posted by Pr335bob

Thanks again ! Gives me confidence . My main worry was the amount of fluid it needs.

1. Buy two quarts
2. Fill until it drips
3. ???
4. Profit.

[raceyBMW]

Just plug your nose, diff fluid smells horrible. To get the old fluid out, you can use a fluid transfer pump, which works pretty well.

[Pr335bob]

Thanks lol will do!