Donna,

You should have your oil changed twice a year, whether you go over 3k miles or not. Time degrades the quality of the oil just like driving it does.

I would also immediately purchase a new OVP and put that in. It will hopefully (and more than likely) clear up many of your starting problems, and the ABS and ASR light.

I would also drive the car for ATLEAST 1/2 an hour like you said you were going to do. But be sure that when you do, you punch it. I mean floor it from a stop all the way up to speed. Of course, do this as conditions prevail. But if you give your car a good hard drive (AKA an Italian Tune-Up), you will burn off a lot of the carbon and other crap that has built up. So drive for atleast 30 minutes and really give it a good run. These engines like that!!

Good luck and keep us posted!!!

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)