what is the most mileage on the engine, until it goes bad?
410043
If the car is well-maintained, then it should never go bad...............................................
332363
you might just need a tune-up, or it could be more serious, try changing the spark plugs, distributer cap and rotor, a fuel additive wouldn't hurt either
86978
try checking ebay..junk yards or any online engine remanufacturer..who does that engine...it cant get any easier
90342
forced induction will give you the best results.  either through a turbo or through a supercharger.  but get ready to spend the most $ also.
404915
Drive less. Get a tune up, in general use less gas.
852521
You need to expand your question.  What type(s) of engines?  Exactly what cutoff time are you taling about?
297699
You either have a coolant leak, a cracked cylinder head or a blown head gasket.  Take it to a mechanic you trust and have it checked out. It can only get worse by continuing to drive it.
124888
if you don't know what you're doing. go to a local auto parts store and check out the repair manual for it.  it should give you a procedure for replacing it. if it seems like too much, then just get it in the shop.  don't put this off either, becuase if you do, it'll overheat and then you're out an engine.
203284
Very bad things. The water will not burn, so the engine will run very rough (if at all), water can also confuse the oxygen sensor and cause the computer to give you a check engine light until it clears up, and water sitting in your fuel system can also start to rust & corrode things from the inside out. The worst-case scenario is that enouth water finds its way into the cylinder head, fills the combustion chamber, and causes a condition known as hydro-lock. Since water can't be compressed, it can cause catastophic engine damage since pistons, connecting rods and cylinder heads will usually fail first under that kind of pressure.\nGood luck,\nSteve
387830
What type of Engine ?,,,Gasoline,,,Diesel,,,Air,,,Steam\nLarge 8,10,12,16 Clyindars\nSmall 1,2,3,4,5,6 clyindars\n\nHit and Miss or 2 cycle, 4 cycle,
984388
I have a 1988 Honda Accord with about 137K on it.  It runs wonderfully.  Everything that you've replaced, I have also.  I also had to have my radiator replaced because the guy that owned it before me poured straight water into it instead of a water/coolant mixture, and water in Las Vegas is very hard, so the minerals built up and clogged it.  I would also check your water pump once in a while because I had to replace that as well.  In addition to visual inspection, I would feel all of the belts with my hands just to make sure that they still have teeth on them so that they don't slip off.  The spark plugs were something I had the biggest problem with, but those are easy to replace.
953766
check the carb, change spark plug...two strokes load up the spark plug very often, check the air filter...and so on..check simple things first..then if u have to rebuild
826388
Simple, get an engine and put fresh oil in it. Run the engine until it seizes up and stops running. The time the engine ran is the useful life of the oil. Seriously, engine oil life is calculated by subjecting engine oil to contolled tests, and then measuring breakdown byproducts and changes in mechanical/chemical makeup.  From this a life expectancy under these conditions can be calculated.
178204
A long way\n\nI have got a Peugeot 405 turbo diesel and I average about 55 miles per gallon.  Engine is 1905cc - 1.9 (not sure how big in American sizes).\n\nHowever, at 130mph, I only average about 40-45 MPG.\n\nAnything smaller than a 1.8 diesel will struggle to climb and sort of hill
70406
If you're looking for speed and power increase, Nitrous Oxide will give you the most bang for your buck, but it will also destroy your engine very quickly if you don't treat it right.
438451
Ask a friend to start it up and run it for 15 minutes every week to 10 days to keep the engine lubed and the battery charged
632075
Heat\nOver current due to a winding failure. \nContamination of the rotating components causing friction.\nHigh freqency components producing harmonics.\nMetal fatigue, from mfg flaws.\nOver loading the turning shaft.\nStarting and stopping.\nAll the above will generate heat which will destroy a motor.\n\nActually, motors will run longer when they are always rotating at a constant speed and constant load within the design criteria.\n\nMaintain clean environment around it will be the easiest assurance for longevity.