How many engines you can put into a car. How long does cars last? Should i get another car?
If the metal of the car frame and body are not disintegrating with time, then you can just keep rebuilding or replacing the engine and other parts as needed. In my area, they put salt on frozen roads during the winter, so the cars are slowly corroding/rotting/disintegrating.
One engine will fit in the car. You're free to swap out that engine as many times as needed, for a replacement. Go to the junkyard and see the mileage on each one there.
If you drive your car 300 miles a week (15,000 per year) and already has 115,000 I'd expect that engine to last another 5 to 10 years if you service it on time and correctly. It's not uncommon for modern engines to last well over 200,000 miles if cared for (oil and coolant being the big two). Of course other parts of the car wear out too. There is no limit to how many times you can fit a rebuilt engine or repair parts. Naturally there comes a time when your car is worth very little and it wouldn't make financial sense to put (for example) $1,000 of repairs into a car that'll only be worth $500 even when fixed. As it gets older, many new spare parts will become harder to find and used parts will be bad too, though engine spares tend to be readily available for 20+ years. But it is a personal choice. As long as the body remains sound, minor repairs done, services maintained, that car can be made to run indefinitely.
'How many engines can you put into a car?" I've owned two cars which had two engines, one in the front, one in the rear: A Citroën 2CV Sahara and a Mini Moke. Both cars were used on at least one occasion to transport a spare engine for transplant into another car, so both briefly had three engines. As for how many engines can a single car get through due to wear and tear, I've owned a Mazda RX7 for which engines were effectively a consumable periodic replacement item and got through three engines in just under 250,000 miles. But properly maintained, almost any other car will have the same engine until the car gets scrapped, although it may need major work every 200,000 miles or so. But modern cars often far surpass that needing no major work. As long as the car is correctly maintained and you never skimp on oil and filter changes, your high mileage usage profile will be no problem for the engine (barring sheer bad luck): it probably has just one fully cold start per day, and does most of it's running at fully correct operating temperature. It's also highly unlikely to do a lot of stop-start urban usage. The rest of the car is likely to cost you serious cash before the engine does: so that means things like worn suspension components, worn steering components, worn propshafts or drive shafts, plus all the usual things for high mileage cars such as saggy door hinges, worn saggy seats, new exhaust systems, periodic brake system overhauls, electrical components failures, and the occasional radiator and water pump. Possibly more than one windscreen replacement as well, either due to breakage or just due to so many chips and scratches that it scatters too much light at night and in wet conditions to be safe. My highest mileage car was a London Taxi which had nearly one million miles on it when I first rented it, and by the time I was ready to buy my own taxi it had just over one and a quarter million miles. It went on to be rented to two more drivers before it got decommissioned due to strict emission rules. I also know that car was a real "janitor's broom" :it had had so many part replaced, including a new (salvaged) bodyshell after a major collision (shortly before I rented it) that there was probably little or none of the original taxi left. I also know that when I took the car it was on just its second engine.
If you are using your car for your business it should be tax deductible, put 10% of your earnings aside for regular maintenance and depreciation and change your vehicle every three years or so.
Most cars within the past 5-10 years can go 200,000 miles without any major problems if it’s maintained on a regular basis. If it’s not giving you any problems then continue to use it. It’s time to get a new car when it starts having regular problems or the expense to fix it is getting too expensive.