Looking at buying 1991 560SEL

[money markets]

I have an opportunity to purchase a single-owner 1991 560 SEL with about 69,000 miles. My independent Mercedes mechanic has serviced this car extensively and tells me it is "perfect" and has no issues, no rust, etc. The car has been diligently serviced. What should I look for and ask about when I test drive the car this week? Is it realistic to buy this car as a Daily Driver given the snowy/icy winters we get in Cleveland, OH? (not sure if this car has ASR). What are the chances this car could end up in the shop on a regular basis with major repairs? Owner is asking $12k; not inclined to pay any more than $10k. Any and all input is appreciated.