Differential oil

Hi,

which good one differential oil for 87 GN? Car see only plus celsius degrees, 10-25 or so.

Thanks in forward,

buick 8791

75-90 diff fluid, don't forget the required Posi additive.

Thanks!

Yes, I don`t forget the posi additive.


I forgot to ask the oil change interval, how it is?

Engine oil, I assume? , kinda depends on how it is driven.

Hi,

actually I meant the differential oil/fluid change interval. Sorry about my inaccurate indication!


buick8791

Unless your a heavy footed driver, I'd say 24k miles. Might check a GNX forum for more precise info.

Tanks again maxwedge!

I have to change the fluid in the wintertime to the sleeping car.

buick8791