How much do dealers normally charge for 15K service. I have 105,000 on my 96 E320.

I also would like to find out actually the hours (per labor manual) to perform all the service items below. I looked at the service manual and it looks like:

check/adjust parking brakes
Check brake pads/discs
check front axle/balljoint/ steering play
lubricate hood hinges and throttle linkage
check all fluid levels
check hoses (coolant system)
check spark plugs/ replace if necessary
check condition of poly V belt
Oil Change

Is changing the water pump/thermostat recommended at this stage? Should I use Mobil 1 synthetic oil or is regular oil OK?