I do the 7.5k recommended by factor but last time I went in they changed my sticker to 3500mi (don't think 5k but I could be wrong) intervals. I asked why and the girl at the counter said per the technician that the cars have been basically eating oil and there isn't enough on the dipstick when I came back in for maintenance. Now, I follow 7.5kmi or 7 months, whichever is sooner. Turns out my 7 months is ALWAYS sooner. Just did my 2nd service (14 months) with just over 10kmi. I need to call Kia pref line and ask them about that. If they say stick at 7.5kmi/7mo I will because I got my car when they had the deal for the first 3 yrs of service (5 services which equates to 36mo or 37.5kmi) free, if they want me to chop my interval in 1/2 I will ask for twice as many services to be paid for as it was a selling point for my car. From the responses no one else has gotten this...