Why do you change the oil in your car?

Answer 1

If you don't it will eventually become sludge and not effectively lubricate the parts that are needed to run your engine. Left long enough without an oil change and you'll be shopping for a brand new engine. Pretty costly considering the price of changing your oil regularly.

Answer 2

Oil undergoes thermal breakdown due to high operating temperature. When this occurs, the oil becomes less effective as a lubricant. And without a good lubricant (read: expensive), parts of the engine rub together and wear each other out.


You'll need some type of oil-filter wrench; here are two sizes of socket-style cap wrenches — one fitted to an oil filter and the other to a 3/8-inch-drive breaker bar handle.
Oil also contains additives that have the ability to neutralize acids. Over time, these additives get used up and stop being effective.

Finally, oil can absorb water, dust and combustion byproducts and also hold them in suspension. Eventually, the oil gets saturated with this stuff and can't absorb any more. Then that stuff remains in the engine and can cause corrosion.

What happens if I don't do this?
Your engine won't last as long as it could. Oil serves many crucial functions, and clean oil performs those functions better than dirty oil. Oil is relatively cheap, and changing your oil every 5,000 miles is a very cheap insurance policy against major repairs down the road.

Answer 3

As your engine runs, it uses the oil to lubricate its moving parts and remove excess heat from the block. Modern motor oil especially has many different lubricants and detergents in it to help keep the engine running smoothly (significantly reducing internal friction) and to take rust and other impurities away. Eventually (after about 3,000-5,000 miles or three months), the lubricants and cleaners break down and are of no longer use.

The oil also removes particulate matter from the engine. If you never change the oil in your engine, it will eventually become thick with grime and burnt particles and no longer protect the block. The oil change interval is set so that you replace the oil when it is beginning to fail.

Failure to change the oil in a car is the most common cause of engine damage. Keeping up with regular change intervals can all but prevent major problems with the engine.

Answer 4

Oil is changed for the following reasons:

1. Oil in the oil sump which travelled approx. 7500-10000 KMS has withstanded extreme high temperatures, splashing, turbulence, Thermal Shocks (When you drive engine it becomes hot and when you park its temperature start cooling down.....and so on a contnous cycle keeps on going).

2. Due to the above cycles, certain chemical changes take place in the oil which starts turning it acidic.

3. It starts losing its viscocity which is very important for a good lubrication between the moving parts.

4. Low viscocity means higher wear of the moving engine parts.

5. Higher wear of the parts mean one has to be ready for higher maintenance & repair costs.

So, a change of the oil brings back the same viscocity of the oil required for that particular temperature (like cold countries, warm countries...has different viscocities...20W40, 20W50 & so on). An oil recomended for a cold country will seize the engine if used by a vehicle owner in the warm country).

This enhance the engine life....hence we change the engine oil.

Answer 5

oil breaks down after a certain period of time. You dont want oil with no lubricating properties in your motor if you plan on keeping your vehicle for longer than a year. New cars dont like bad oil as it can clog up filter, lines, and the oil pump. Most old cars are forgiving but only to a point. Old oil clumps up after a time and gums up the valve springs and everything else it comes in contact with inside the motor. You want your motor to work smoothly, not fight itself just to keep running. I'm an ASE certified tech in case you were wondering.

Answer 6

Well I guess you've never seen engines where they had idiots driving them.... and never or barely changed the oil..... the oil gets thicker and thicker, picks up more and more wear particals and dirt and gas from some blowby....... and after a while starts to clump up and turns the engine into a sludge cake..... basically becomes a valve grinding like compound...... may or may not blow the engine up but might just seize up.

Answer 7

As oil is used it gets hot and dirty. Over time, it loses it's ability to properly lubricate your engine and gets thick and sticky. It you leave it too long, it''ll potentially ruin your engine.

And without oil, your moving parts in your car will stop moving and lock, making your car a very large paperweight until you get a new engine or car :p

Answer 8

because the oil wares down and it doesn't do the job so you need to put fresh new oil in. It will extend the life of your engine.

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There are only a few basic reasons why it is necessary to change your oil, and they all, in the end, have to do with decreased protection of your engine and decreased performance. If these elements can be minimized, then there would be little or no reason to change the oil.

Answer 9

Oil over time tends to pick up impurities and these impurities can abrade the surface of the piston rings causing the oil flow irregularities. Over time this will wear on the engine.

Answer 10

oil helps the engine run smoother
when the engine runs smoother it will last longer
i suggest changing your oil at least every 8-10 thousand miles
unless you have a toyota truck
then studies have shown it only needs to be changed about every 15-20,000 miles