I HAVE A 1998 MERCEDES E200 CLASSIC I'M TRYING TO

okay, what is the problem with the anti theft on your 1998 E200?

battery location is in the trunk beside the spare tire under the carpet and some trim models they are under the rear seat, hope this helps

Worst case you could try removing the radio. I know Acura has a label with the code on the back of the radio.

I don't want you to take it out unless you have to :) Just in case there isnt one there.

Should be at the bottom, middle front, of radiator
behind the bumper.
Regards
Rob

Mercedes has a cold start valve to spray extra fuel to assist the ignition when the temperature is cold. This is the problem with the cold start valve is not opened when it needed. There are 2 possible causes: 1- The valve is bad. 2- The coolant temperature sensor is bad.
The valve part is expensive and labor is not cheap. The first economic way to address is to replace the coolant temperature sensor. This sensor gives a different resistance reading as temperature changed. When it is bad, it give an erratic reading at cold temperature so the ECM could not recognize to give a signal to open the Cold start valve.

probably, because of the labour costs, try ebay, you may get them a lot cheaper , and fit them yourself, probably for half the cost

sensor located in the exhaust system somewhere they just unscrew to remove

electronic key batteries last less than a week is key duff if so were can i get a replacement at reasonable price

The proper oil for any car, depend of the mileage, temperature conditions , altitude condition.
temperature below 40 Farenheit. recomeded oil is 0w20.
Some manufactures recomended use 5w20 in all conditions. and miles.
More than 40 f. 5w30 to 20w50,
If you car is in 0 miles to 30,000 miles 5w30
30k to 50k 10w30
50k to 90k 10w40
90k and up 20w50

This is just a recomended reference or table.
always consult with your owners manual.
Or manufacters spec.

80 degrees Celsius