Quattro differential oil: Synthetic or regular?

Hi, I've got an old 5000 Turbo Quattro (1986, great car) and am
wondering what to put in the differentials. Everybody says that synthetic
oil makes a big difference, what exactly is this difference and how would
I know it? Is it worth putting in an old car like this?

Thanks,
cp

Check with a Audi dealer to find out. And Synthetic oil is for the
motor. There's specific oil for the diff i'm positive.


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Waldo
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