i have an '82 300D with nearly 197k. i live in the city so i drive at low speeds most of the time. today i drove on the highway and noticed that my steering wheel was tilted to the right just a bit in order to keep going straight. i found myself having to turn the wheel back and forth quite a bit as i was driving. it felt like a lot of work just to keep going straight...could this be the steering needing to be tightened up? tires? suspension? i just had my snow tires put on a couple of weeks ago...could they be out of alignment? any help would be appreciated, thanks

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"helga"
1982 300D
white/navy 191k