Generally platinum plugs will last 100k +/-, unless you do only drive in stop and go traffic. The flushing of the cooling system, is also excessive maintenance at 29k unless there is a sludge build up in the coolong system. Trans fluid change is not required at 29k unless it is "burnt" and if the differential fluid is synthetic will probably last the life of the xfire and if it's not and you don't abuse it about 100k. The biggest "mistake" people make is the over maint. of a vehicle. While this won't harm the vehicle it may require you to put off some required maint due to lack of funds. Also, I have read numerous comments here about changing the oil filters at 3k, but that is absoulutely not required. I manage a lagre fleet of vehicles (for a living) and the only oil filter failures I have ever seen in my 30+ years in the automotive industry were due to either a manufacturing defect or improper installation, they will definitely last as long as ANY OIL Change.