So I just got back today from my two day trek in picking up my "new" Crossfire. I will have VIN, pics, etc up soon. Here's the deal....

I flew to Milwaukee (MKE) from Philadelphia (PHL) and that was somewhat of an ordeal. I ordered online, checked in online to make things at the airport that much easier. I get to the ticket counter and ask if I need to do anything there as I show them my online printed boarding passes. Since I had no bags to check, only one carry on, they told me no, and head to the terminal (Mistake no. 1)
I go through the terminal taking off my shoes and doing all the things Al-Qaeda wanted me to do in sercurity and I get to my departure gate and wait. And wait. And wait some more after that. My tickets had me leaving philadelphia @ 630am and my connector flight in Cleveland leaving @ 825 am. Weather wass deterioriating in cleveland so my times @ Philly were pushed three times. After seeing departure was after 830, (When I should have left Cleveland, let alone Philly) I talk to the agent there. She looked me up and told me I was pushed to an earlier direct flight @ 6am (The current time is about 745 when I hear this) She asked me why I didn't check in @ the counter and I told her about the guy @ the counter telling me I didn't have to with purchasing online. Had I done so, I would have been gone @ 6. Instead they transfer me to another Carrier and I had a direct flight with Midwest only it left @ 1130 am.. Now I'm heated. So I finally leave Philly "on-time" @ 1130 am and get into Milwaukee just before 1pm central. Wisconsin was beautiful. It was sunny and close to 70 degrees. I was expecting to freeze my @$$ off. Got to the dealer about 130pm and was on the road by 2pm. Smooth sailing until Chicago.
Because I'm not a native there I don't know where to position myself for the merge-a-thon between 294 and 94 so I was stuck going through Chicago. Took all about an hour and a half to go about 3 miles. My goal was to make good time and this wasn't conducive. I've filled up twice once in Indiana and once in Ohio. Crossfire had Great mileage, a lot better than what I'm used to in the Jeep. The GPS had be on the road for about 13 1/2 hours with a total trip of just over 880 miles using 36.4 gallons of gas. About 26 mpg with "Spirited Runs" and Chicago traffic.
Here's the questions I have; and I have used the search function just couldn't get some stuff.

The Crossfire is an 05 limited coupe Machine Grey with Slate/Cedar interior. 18,109 miles for $13,500.

The rear tires need replaced, the right rear looks like a slick while the left has some tread, the fronts look new. Using the Search function seeing others recommendations I think I'll replace the two with the Goodyear F1-GS-D3's
The TPMS light is on and we have a STAR Scan tool @ school so I'll check that out, the tire pressures are good.
The maintenance advisor in the odometer intially said
-2,700 and now says -3,200, I originally thought negative was good until I saw it start climbing, so either the oil was changed and no one reset the maintenance alert or it hasn't been changed so I went to Wal Mart to get some Mobile 1 but no 0W40. Had to go to Pep Boys and got 9 qts @ 6.49 a qt. But I couldn't find the part number for the oil filter cap. Can someon help me out?? I'd like to go the the Mercedes dealer tomorrow and get that so I can change out the oil.

So that's my story...
1.) Tires
2.) Oil
3.) Part number

Thanks in advance
Justin