Optimally, engine oil should be changed every 3,000 miles. Some car manufacturers have modified that to 5,000 miles.
Engine oil breaks down after a period of time as well, so it's best to change that oil at least every six months to a year, even if the vehicle hasn't gone 5,000 miles.
I respectfully have to disagree. The 3,000 mile oil change was a good idea 30 or more years ago but in modern cars with modern oil and filters it is a total waste of money and oil. There are still a few car models that recommend 3,000 miles but they are rare. Only oil change shops who make money on oil changes recommend the 3,000 mile oil change as a marketing plow to get your money. Almost every auto manufacture recommends 5,000, 7,000, or even 10,000 miles. Of course it also depends on how you drive and where. If you drive in very dusty conditions then 3,000 miles might be appropriate. But for the average driver that is just overkill and a waste of your money and oil. Change your oil according to what the manufacture of your car recommends and do not listen to people who make money off oil changes or people living in the past.
Then that car has a neglected engine that will not last very long and I would not want that vehicle at any price.
Not very long at all. Without engine oil the engine will lock up and become unrepairable. You will have to purchase a new car of this happens.
Mobile 1 engine oil can last up to 15,000 miles. However, it is recommended that the oil is changed every 3,000 miles.
That would directly relate to how long you want your engine to last. No kidding... The oil is the lifeblood of the engine - without it, or not enough of it, the extreme stresses of all those moving metal parts will rapidly wear the surfaces and dramatically shorten of the life of the engine. Skimp on many things, but never skimp on taking car of the engine oil.
You oil will get dirtier and dirtier, the filter will clog and the engine will start the wear. Eventually the engine will develop sludge and in the end the engine will not last very long. I would suspect a brand new engine that you kept driving and never changed the oil might last 50,000 miles at the outside before having major internal problems.
If you put gasoline/petrol in the oil resivoir of any engine, you will destroy the engine if you do not drain the oil and add fresh oil immediately. Start running that engine and it will not last long.
what is a good engine oil to use in my car
if your engine is knocking that means you need oil. go get an oil change or add a quart asap or the engine will burn out
Probably not for long. If the engine is deprived of oil, it will seize up and stop running. What kind of car is it and how do you know it has a weak oil pump?
the engine will run hot and eventually it will blow on younot true.. if you have no oil in your engine it will not last long enough to overheat... the force of the pistons moving will cause so much friction, add that to the lack of lubrication and your engine will seize up and never work again...
not to long at all you need to fill it up
An oil leak is always going to be out of the engine as the engine contains oil and the car does not. I think you are saying you are loosing oil with no apparent leak. If that is the case the engine is burning oil and that is why you see no leaks.