Differential oil & brake fluid

[russiankid]

I need to change both. I have the brake fluid, but I am not sure if I can change it like on a regular car. By regular I mean have someone pump the brakes while I open the bleed screw and repeat until clean fluid comes out. I have ASC+T, so can I change it the regular way?

For differential fluid, the owners manual wasn't much help. What weight oil should I use? Should I get synthetic?

Thanks.

[Rus]

To help out the forum gurus, we've checked russiankid's diff tag and it does not have an S in the designation number, so no LSD. My owner's manual recommends SAE 90 GL-5 hyphoid gear oil for all models, but this is a 1990 production year manual.

[632 Regal]

GL-5 is good, if the weather is warmer than you can use the heavier weight. By all means I would suggest a synthetic lube as there gears are marginal in size vs strength.

[attack eagle]

sorry no help here for non lsd, but for lsd oem was= to a 75w-90 which has been superceded by an 80w140 equivalent.
I run mobil one synthetic 80w-140 and did not need to add any additional friction modifier, unlike those that run redline stuff.

the prices for the BMW stuff =crazy

[632 Regal]

M-1 didnt cause any clutch chatter around corners??? I ended up having to put in the additive it was so bad.


sorry no help here for non lsd, but for lsd oem was= to a 75w-90 which has been superceded by an 80w140 equivalent.
I run mobil one synthetic 80w-140 and did not need to add any additional friction modifier, unlike those that run redline stuff.

the prices for the BMW stuff =crazy

[BigKriss]

okay, non lsd is 75w-90 by the manufacturer and yes do brakes the regular way. no worries mate.

[attack eagle]

M-1 didnt cause any clutch chatter around corners??? I ended up having to put in the additive it was so bad.
not with the 80w 140.

[Bill R.]

synthetic gear oil for the differentials and no conventional mineral oils , this applies to older as well as newer cars.

As far as the brake bleeding i would use a turkey baster to suck up as much fluid as possible out of the brake reservoir and then fill with clean new fluid before you start bleeding them.

[russiankid]

Thanks for the replies. I'll most likely tackle both of these jobs once I replace my oil filter housing seal.