Really, for what you are asking, you could leave it in there for 30 years.
The thing with Synth is you have to understand that it's shear force is better than oil, but once you put Synth in your engine, you don't want to go back to conventional oil. Because of the increased lubricating properties of the oil, it will block conventional oil from pours in bearing surfaces. So just never change it back.
If you drive the car that infrequently then you should ignore the mileage and do all maintenance by the month. There are guidelines in the owner's manual. I think for oil it's a year. Some synthetic oils might contain extra anti-corrosion (anti-rust) additives which may let it last longer than a year. There are also oil additives you can buy for such. But otherwise no matter how nice the oil is when it is sitting a long time water gets in and it rusts. You may want to use something cheap instead and change it yearly. Likewise coolant needs to be changed every 3-5 years no matter how few the miles to prevent engine destroying rust. See what the manual says about several other items before you wreck your car.
If all that maintenance seems like too much cost for a car you hardly ever drive, then you may want to google up a guide for car storage procedures and leave the car in storage for years at a time before driving again. But don't just let it sit there without following these procedures, or you'll wreck the car.
Whoa, good question! With synthetics, no real way to tell w/o having an oil analysis. At the risk of sound silly, every year I'd pull the dipstick, run my fingers down it to fell consistency, grit, stickiness or whatever, and as soon as it felt different, change it. Or every 3-5 years.
here lies the problem. blowby from internal combustion engines causes an acidic buildup in motor oil. this eats the soft babbit materiel on your bearings. once the vehicle has been ran the timer has started.
to my knowledge synthetics like most oils do not contain an acid neutralizer.
i learned this in the us navy some years back. engine can sit indefinitely until it has been started, then the navy runs by an hourly/monthly maintenance schedule.
it is the nature of the beast my friend
Driving a car 500 miles a year is going to give you a whole host of problems other than just how long you change your oil. At least once a week crank the car up, drive it fast enough the transmission shifts through all the gear, and nail the brakes really good a time or two. Drive it long enough everything gets up to operational temperature. At least 20 or 30 minutes. Allowing a car to side idle for long periods of time isn't doing it any favors, no matter how often you change the oil.
Changing oil regularly is the cheapest way to avoid future problems with your engine. If your car is in a closed garage that doesn't experience high temperature differences, you can let your car sit with the same oil for probably around 2 years. But if you leave your car outside, temperature change will effect the bonds in the structure of oil faster. So, you should change your oil once every year. To be on the safe side, I would say once every year, as many mechanics would suggest.
I think the usual guideline is 15,000 miles or one year.
if you want an accurate answer, wouldn't it depend on many factors? like what type of metal was the engine made of? the temperature? who knows
I have a car that I almost never drive, maybe less than 500 miles a year.
My question is how long in terms of years will synthetic motor oil last in the car?
All information online points to a number of miles however at the rate I drive the car, it will take 30 years to reach the number of miles they are talking about.
In terms of years, is there any guidelines ?
There is a lot of false information by companies that want to make money saying that you need to change your oil more frequent than actually needed.
I would like to get more of a realistic answer.
Thanks.
