"I have owned a 1991 164 S for 8 years and it is a wonderful car. Fast, beautiful, fun, safe (I am told), and economical, at 27 MPG highway. Mine has about 160,000 miles.
It can be hard to find a good mechanic who will work on it, but once you do, the car is as reliable as other European cars, however, some parts can be hard to find. A mass air flow meter needed replacement and aside from being extremely expensive, the mechanic had difficulty locating one. I am, however, told this part is something that rarely goes, so that can explain the reason for this. Also, the spark plugs on the S and Q can be hard to find and expensive if using the factory plugs, although other plugs work fine and are easier to find. That said, most parts are less than those for BMWs, Mercedes, way less than Jag, Porsche, and Audi parts, and about the same as parts for Saabs and Volvos.
One strange thing, the car has diffuculty running on California's 91 octane- I usually mixed it with some 100 octane at certain 76 stations, although 93 octane in other states works normally (I have owned the car while living on both coasts). It can be run on 91(most owners do this) although there may be some knocking at certain RPMs. On 91 while in CA, I never had trouble passing the strict emissions there, even with high mileage.
The car is quiet and rides well, plus, you get many "thumbs up". I definately recommend a 164."
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