87 325

[viali8]

i am going to change my differential oil and was wondering what brand of oil to use. not sure what works best in bmw. also my owners handbook says to use a 90 weight oil. is that a straight 90 weight oil or would it be 75w-90 or 80w-90? any info. would be greatly appreciated. thanks in advance.

[MrM3]

i think 80w-90 or just 90 would be fine, but you may want to get a second opinion

[Dirty_Tool]

if its not a Limited slip then 80/90 is what you want

[BimmerKris]

since it is up what would you put in an LSD

[greenlightracer]

What about 75 - 90 Synthetic? would that be ok?

[BMWJNKY]

75-90 is what BMW recomends for diff. fluid. Also it should say GL-5 on the container. GL-5 is is for the diff. and if you have a stick GL-4 goes in the trans.

[Le_max]

that funny because I was just reading about diff lubriquant jsut today

On LSD differential, Synthetic Gear Oil such as Motul Gear 300 75w90 will not allow the LSD to engage properly. You need to add a Limited Slip Additive to your lubriquant. Thats is where I get confused. Motul dont supplie that additive in america. There is one from Kazzz (costs a bundle and impossible to get). Finally, there is one very cheap and easy to buy.... GM Goodwrench Limited Slip Axle Lubriquant Additive.
Does anybody have tried any of these additive on there LSD?
Does anybody have experienced traction problem when not using these additive?
Are the additive for "Clutch type LSD" or "Viscous Coupling LSD"?
On a 325is, the LSD is a "Clutch type"... right?

[Le_max]

I'm back from my BMW dealer, the guy told that they used to add Mopar (Chrysler) Limited Slip Additive Friction Modifier in the diffential lubriquant they where changing in the garage.
So I went to a Chrylser dealer, sold me a bottle of 4 FL. OZ for 12$ canadian. On the bottle, it says that it reduces the noise from the differential when equipped with an LSD. According to the dealer, it also helps the LSD to engage on slippery pavement. On the bottle, the recommanded proportion is 2% to 5% by gear lubriquant weight.

[greenlightracer]

How much should I add... and oh yea... I think my diff is leaking oil.. any idea on what to do?

[Le_max]

I actually dont know how much diff lubriquant goes into the diff,... I would says
1 litre approx. So 3.5% of 1 litre is 35 ml wich is about 1 third of a bottle ( of 120ml )

Some guys have told me, "you add some additive until your diff get quiet!" B)

[viali8]

1.8 quarts or fill it to the bottom of the fill whole. basically when you stick your finger in the fill whole u should get a little oil on the bottom of your finger.

[viali8]

excuse my poor grammar. HOLE!