Rear End Gear Oil?

[Toxicadam]

How much does a '99 Grand Marquis hold and whats the right weight to use?

[Rizzo]

2.75 qts

AVOID THE DEALER !!!1

I'm a Motorcraft fan boy as much as the next guy but they want WAY too much for it.

Ford specs 90(5?)-140 , But I have run 80-90 and 75-90 without problems. I always go for the full synthetic stuff.

[Toxicadam]

Thank you.