hi,

I'm currently at 23k miles, i missed my 15k (but have changed oil regularly). I dont want to mess up my warantee, should i do the 15k or maybe go for the 30 ?

Thx

if you change your oil and rotate your tires regularly, you should be fine.

all other 15k mile service are inspections (brake, clutch, suspension, etc). as long as you inspect these items and they're ok, you don't need to do any work on them.