[quote]Well, i went ahead and changed it at 5000K. I also lubed it - which I've been doing every 10000-15000K. The reason I asked is the price of oil & filters here is outrageous. $18 for the filter, which I guess isn't too bad, but $6-7 liter for oil?

If only it was that cheep. I was just qouted from Napa $55.00 ea for the appropriate oil filter. I managed to get two from a part shop called Auto Value and they were only $32.00 ea. Normally I get them through a friend owned part shop at cost but they still are over 20 bucks. Oil is a bit cheeper at 13.00/4L for Rotella T. For this reason I change my oil every 8000km and a fresh filter everytime. I always put a new filter even if I was running gas and changing the oil every 4-5000km. I mostly do highway driving and about 140km/day. I will change my oil sooner if I am in dirty dusty conditions and on occasion run a pre oil change cleaner through such as seafoam or like my last one, just Mr. Gunk. 5 mins and a quieter diesel guaranteed.