62k miles on my 01. No IMS failure yet.
Oil change every 12k-15k miles or 2 yrs, whichever comes first (Mobil 1 0W-40 only oil ever used).
Failures:
- 38k miles (cracked coolant tank; replaced under warranty)
- 58k miles (worn motor mount; replaced with new 987 mount)
- 59k miles (broken water pump; replaced with new one)
- Fall 2009 (cracked plastic rear window on soft top; replaced with OEM 03 glass windowed soft top)