- I did the zip tie thingy but I do not think it is essential at all. I personally think the O-ring is undersized, allowing it to protrude under pressure.

- The improved O-ring, you can tell it fits tightly and should be good for a long time, with or without the zip tie thingy.

- Even without the zip tie, you cannot wiggle the couple b/c it is held by 2 separate tabs.

- On the other hand, the zip tie does not hurt, just a placebo effect b/c it is not proven. I did it anyway.

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT