Engine Overall?

No need to fix what isn't broke.  If you currently have no issue with your engine, having an engine overhaul is just a total waste of money.  If you maintain your car well with regular oil changes and tune-ups, you can legitimately expect to have good dependable transportation for much longer than 5 years.  I have a 1986 Dodge Ram that is still running strong, with over 200k miles on it.  http://www.best4health.net

I agee. do not spend any money trying to prolong the useful life of the car. regular servicing and timely repair of "ware out" parts (bakes, tires, transmission fluid, front end alignment, etc)  are necessary.  with regular maintinence the car should go near 200,000 miles.  If you spend a lot of money for the engine rebuild or transmission replacement, and the car is totaled out by an accident the money is not recoverable.  haveing the transmission fluid flushed (not just drain 3 quarts and refill) may be a good investment.  keep the car clean inside and out. this will make you feel better and preserve some to the trade-in value later.

The technology for the extended life of a new engine does, in my opinion,make it more favorable than in the past.  There are other factors to consider, such as the overall condition of the vehicle, are you "tired" of it yet.  So if you think you would do it when your present engine is ready I would say go for it.