This is a question that you will get a thousand answers to and all will vary from person to person.. Synthetic oil was engineered in a lab to get the best qualities from conventional oil and adding and enhancing qualities conventional oil doesnt have. So yes you would get more use from synthetic oil than regular. The actual amount of mileage varies greatly because of vehicle history, use and type of oil used. a car driven for basic daily commutes oil will last longer than a truck hauling a heavy load daily up through the hills and mountains. The safe general idea is about 6K miles. If the car is old and has quite a few miles the switch to synthetic may cause issues. synthetic oil cleans better and on a molecular level is more uniform and stable so if your car has 180K miles and have only used regular oil the synthetic may clean the engine enough to start producing leaks where the old grungy was the only thing keeping leaks at bay.. As far as changes some manufactures have oil that is rated to 10-15K miles would you ACTUALLY get that? not usually but still considerably more miles than regular oil though..

In theory, starting with a clean new engine, synthetic oil would never ever need to be changed, only the oil filter. Thusly, a 12,000 or 12 months is very realistic IF the car has used synthetic oil since new. In practical terms most of us do not need synthetic oil for our needs. I prefer synthetic blend. It is much cheaper, it has the same characteristics of synthetic, and I have the cars serviced every six months with the changing season. Many years ago an oil company had an advertisement that a fleet of cars that used their oil for six months or so, got the old oil tested. It was still functional and serviceable. That was on a taxi that runs 10X the miles than we may do.

We need to know the year make and model of the car. If the car has *under 60,000 miles on the odometer do not exceed the manufactures oil change schedule in the glove compartment manual to keep the power-train warranty in effect.

It depends on the Brand, quality, and filter. I would advise you to research the brand, quality and filter. AMSOIL 100% Synthetic for example can go 25,000 miles on the same oil and filter.

Completely depends on the vehichle. The general guidelines given by a lot of new dealers is 5k for some miles and up to 7k for others. I would say if it is not a new vehicle I would do it every 5k

Completely depends on HOW you drive. Nobody can give you a pat answer without knowing that. Read this post on oil change intervals

http://ricksfreeautorepairadvice.com/whe...

Depends on the vehicle, could be over 20,000miles on some modern cars if on the long life servicing schedule.

twice of reagler oil

look in your owners manual

4500

6,000 miles.