You do not need to fill up early just confirm your siphon jet is working.

You do this by monitoring test six and when the total fuel level gets below twenty seven liters, the right side should stay at one point four liters.

If the right side drops below one liter, stop and get gas. You only really need to do that test one or two times a year.

The o-ring failure is from a design defect. The o-ring seal is held together from the center of the assembly so it just torques sideways. You can put a shim in the opposite side and it's forever fixed.

Every first gen x will have the problem eventually.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)