I've just finished looking through several threads on suspension fixes and changes. My 4.8is with 160k miles (and 4 corner air suspension) has a leaky front bag (or strut, not sure which).

Option 1 is to replace the two front struts/bags (it seems the common recommendation is to do them in pairs) at a cost of around $1500-2000. The problem with this approach is, of course, the rears and compressor, etc might not last much longer (or they might). Benefit is original design (even if I use Arnott).

Option 2 is to convert to coil over suspension on all four corners. Parts cost (ECS Tuning) looks to be $1200ish so probably $2k installed. Perhaps there is salvage value in most of my old parts. Problem is I don't know how the beast will feel or handle, or if other issues will pop up (or out, like rear half shafts). The threads I read through seem to report good initial results - but how has it been over time? Benefit is no more worries about those air components.

Would appreciate any and all input and recommendations. Bonus points for good humor and amusement!

Thanks in advance.

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Mike

2005 e53 X5 4.8is 169k miles
2018 f90 M5
2018 Volvo XC60