How long do lift gate struts typically last?

My 2008 ML 320 CDI has the Power Lift option on the lift gate. The lift gate struts are original. Have no issues with opening or closing. I just do not want to wear out the power lift hydraulics if the struts are weak.

My 2008 ML 320 CDI has the Power Lift option on the lift gate. The lift gate struts are original.

Have no issues with opening or closing. I just do not want to wear out the power lift hydraulics if the struts are weak.

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