Date registered: Feb 2006
Vehicle: 1995 C220 elegance auto.
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The question you are asking is akin to "how long is a piece of string". There a many factors in how long a car will remain reliable, the main one being how it has been cared for and serviced ,if as you say your's has been well looked after there is no reason why it should not go on "operating smoothly".
Just carry out the routine maintenance changing the oils more frequently than recommended and it should see double your existing miles.