My car ran out if coolent. It was overheated. The car towed away.

What is your question?

Two mercdes mechanics told me, I need to buy a new engine at a cost of $7000.00. advise d me to buy another car. What do you suggest? It has 260,000. It was running very nicely till car got overheated. Only second owner.

What makes this problem better or worse?

Worse.

How long has your 1991 Mercedes-Benz 420SEL had this problem?

One week.