I really haven’t been able to find a reason to do a spring conversion on my e53. Granted, I only have the rear air springs on mine, but they have been quite reliable and I like the ride with them. They also handle the mild off-road stuff I do when hunting fairly well. The failures have been just as Andrew described- leaking down overnight. The air springs are a very simple job too.

Air springs on all four corners may be a different story though. I know my wife’s 2015 grand Cherokee was a huge pita to troubleshoot when it develop leak, and at the end of the day I never found it. Hence the spring conversion for that car.

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Current
Original owner 2002 E53 X5 4.4i to 4.6i swap
2026 G80 M3 6 spd
2025 G06 X5 50e
Former
1972 Audi Fox
1986 Saab 900S
1996 BMW Z3
1998 BMW E36 M3 Sedan
2004 BMW E46 M3
2006 Audi A3 Quatro
1993 Mopar 318 Jeep Grand Cherokee
2015 V6 Jeep Grand Cherokee