If my friend doesn't change the oil in his car for 10,000mi, what will happen?

Answer 1

It can really depend on the car, the oil and the way the car is driven. The idea that oil needs to be changed every 3000 miles is false you should consult your owners manual for you car to determine how often to change your oil. Some cars recomend changing the oil every 7500 miles. 10,000 is a bit excessive and the oil should be changed soon. There are products like amsoil that will let you go a very long time without oil changes.

Answer 2

Probably nothing.. In these days of lead-free gas and computer control, oil can last a very long time. It will look terrible, but usually you can stretch oil changes out for 2 or 3 times the recommended time or more. One trick is to just change the filter. If you use synthetic oil, you may never have to change it.

However,, the above is true only if you do a fair amount of highway driving and are using the car regularly . . . and you will surely void the warranty.

Consumer Reports did a study some years ago using regular oil and NY City taxicabs. They found oil did not fail in anywhere near the recommended change intervals... you might look up the study in your library. good luck.

Answer 3

It all depends upon how your friend is going about it. If he uses full synthetic oil, and changes the filter at 5K which should give him room to add about a quart of fresh synthetic oil, it should be fine.

If on the other hand, your friend is using regular oil and not changing the filter he/she is asking for trouble. The filter will undoubtedly be fully clogged well before 10K and won't be doing anything except letting oil bypass the filter completely. (Most filters have a small bypass valve within the filter so that oil can bypass the element when it becomes too dirty to pass oil efficiently.) Better to have dirty oil than no oil at all!

Anyway, the contaminants in oil will pervade through the engine causing premature wear. Also, regular oil cannot withstand these harsh conditions and will suffer thermal breakdown, a condition that will actually change the properties if the oil (mainly it's viscosity)and inhibit its ability to lubricate and disipate heat, causing further damage and premature wear. Not good.

Answer 4

Depends on the car and the type of oil being used. Many of the new cars don't need the oil changed until about then in optimum conditions, some need it more frequently.
GMs have a light that will tell you when to change the oil. If you do it sooner than the light, you are just wasting oil.

Answer 5

Your friend car will eventually become a junk in no time. Without changing the engine oil that long is not recommended by the manufacturer. By common sense it's not right either. In the long run the engine oil level will go down and loses it's pressure. It loses it's lubricating power and eventually the engine overheats and damage the internal combustion chambers and there's no way to fix it than to overhaul the whole engine, change engine or send it to the junkyard.

Answer 6

The engine will eventually seize.
Depending on the car and how hard its driven, the oil will eventually breakdown and thicken and/or mix with water and cease to lubricate the moving parts of the engine this will cause frictional heat between the contacting surfaces and a bearing would fail or the pistons would melt to the cylinder walls.

Answer 7

Actually several manufacturers have 10,000 mile recommended change intervals. I think that is going out to the outer limit if you are using regular oil, and probably not excessive if you are using full synthetic. I have an F350 Truck that has a 7,500 mile change interval.

Answer 8

probably not much, at first. but as you keep operating an engine without changing the oil,the oil picks up more and more dirt and debris, and it eventually will start acting somewhat like sandpaper, scouring and scrubbing the metal of the cylinders, crankshaft, camshaft. ect untill enough damage has occured to cause catastrophic engine FAILURE! not to mention sludge, and other associated depressing problems. Change your oil regularlly, it is CHEAP insurance.

Answer 9

as long as don't get any overheat,the oil will not transform in plastic.
Plastic is made out of crude oil.
the oil.
it's a process,start by self desintegrate in liquid and body, the body fist stage is gum ,then suddenly get into hard plastic.(the gum stage, it has a long period ,but that does not means is not destroying the engine)
the liquid evaporate very fast,because is fuel.
the final stage is a dark carbon.melted inside the engine

Answer 10

the oil will be very contaminated and gritty, but it won't do much to the engine.

it is just that added stress the less effective oil creates

now 50,000 then you will f*ck it up