Rear wiper loose
 

I have tightened that 13mm numerous times.
Always seems to be loose quickly.
Any fix on that?

Will a small lock washer fit on it? Or use some Loc-Tite on it. Or a metric nylon locking nut.

BTW- I swapped to the E70 arm and blade and it sits much better on the glass.

However for your issue, would a little blue loctite help? Are the threads on the post stripped?

Can you supply the part number for the E70 rear wiper?

I purchased the following on Amazon last August and it works much better than the e53 aftermarket, cost about $20.00

Rear Wiper Arm Blade - for X5 X5M E70 2007-2013 - MIKKUPPA Back Windshield Wiper Assembly Replacement - All Season Natural Rubber Cleaning Window

rwilson,
Thanks for posting a part number. I'll add it to my maintenance spreadsheet for the next replacement.

Rear wiper loose
 

I also replaced mine with e70 part. I didn't love that it leaves an inch or so more missed at the top but it looks nicer and did a very clean sweep.

I was looking for a longer replacement snap in but traded the car in before I needed.

Installed new E70 wiper arm. Looks great, works great!
Thanks X-men

Those Rear Wipers will scratch your window. I just avoid using it. I will Most likely delete it soon and will replace it with a square looking plug. Rainx Glass ceramics always helps. I just apply it on once in a while.