Hey guys, I was just wondering what the maintanence costs on an M6 were on or about the 130k mile mark. Just wondering.
T'anks

Maintenance on the engine includes: Valve adjustment, throttle synchronization, base idle adjustment, idle CO adjustment (it says no adjustment, but it should be done at least every 2 years), water pump, radiator (only if aging/cracking--$$$), ignition cap, rotor, plugs, wires ($$), various coolant hoses, vacuum hoses, etc. Check for leaking gaskets. Oil pan gasket is labor intensive.

Maintenance on the suspension includes: Lower control arms, upper control (thrust) arms, heavy duty thrust arm bushings (urethane or manchined 750iL), tie rods, idler arm, self-levelling system check. Check shocks. Loose steering can be adjusted. Consult the factory shop manual for adjustment procedure. Front wheel bearings are not expensive, not too hard to replace, either. Rear bearings are cheap but require several special presses/pullers to get the job done.

The front calipers should be checked for torn boots. These 4-pistons calipers will seize badly if any boots are torn. Rebuild them ASAP, before they seize. The rotors aren't usually warped. The thrust arm bushings and tie rods get sloppy, causing a bad shimmy especially under braking. Don't replace the rotors until the front suspension/steering is verified to be tight.

The AC should be checked. If the heater doesn't work, replace the heater valve core, about $30.

It all depends on the level of care the car received. A neglected car or one that was driven hard will need nearly all of the above checked, and many of the parts will need to be replaced. The really expensive parts are the radiator, thrust arms and urethane (aftermarket) bushings, rear self-levelling suspension parts (any of them), rebuilt calipers (rebuild them yourself and save lots $$), catalytic converter, rear muffler, AC compressor, and I'm sure there are others. Valve adjustment should either be done by an experienced shop, or you can do it with the $130 special tool. Shims are the same as many Volvos and are in stock at most Volvo dealers. Throttle sync and base idle/CO need special gauges.