A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

Rear diff fill plug

Old 09-13-2010, 11:02 AM
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Default Rear diff fill plug

Hello,
I want to get the rear differential fluid changed before the season changes on me and those knuckle busters really hurt. I went under there yesterday with a 10mm allen, but it's too small for the fill plug. it fits nicely into the drain, but not the fill. The next size I have is 17mm and thats way too big.
I was reading some posts and it was mentioned to make sure you can get the fill plug out first, I had to chuckle, I get it. I was thinking that, at the time.

Anybody know off-hand what size I need to buy for a '97 A4 2.8 Q MT?

I really don't want to buy more than I need, they are rarely used anywhere else.

Thanks
Bruch
Old 09-14-2010, 06:27 AM
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Sorry I don't recall, but I busted mine trying to get it loose! I did get it out but had to use heat and a extra allen!
Old 09-22-2010, 04:44 PM
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Originally Posted by Bruch
Hello,
I want to get the rear differential fluid changed before the season changes on me and those knuckle busters really hurt. I went under there yesterday with a 10mm allen, but it's too small for the fill plug. it fits nicely into the drain, but not the fill. The next size I have is 17mm and thats way too big.
I was reading some posts and it was mentioned to make sure you can get the fill plug out first, I had to chuckle, I get it. I was thinking that, at the time.

Anybody know off-hand what size I need to buy for a '97 A4 2.8 Q MT?

I really don't want to buy more than I need, they are rarely used anywhere else.

Thanks
Bruch
I believe 14mm allen, but measure/research to be sure.
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