Is it ok to change a car from oil to synthetic oil at 100,000 miles?

I just bought a 98 Grand cherokee and it has almost 100,000 miles on it. Will it be ok if i make it synthetic oil now?Is it ok to change a car from oil to synthetic oil at 100,000 miles?
As an AMSOIL dealer and user, I have been asked this question many times, yes, but only if your vehicle does not burn or leak oil. As to the cost yes it costs more. but with AMSOILs 25,000 mile change schedule, yes research has been done and proven to be OK, the cost come in line with non synthetic oil. Also engine wear is decreased, extending the life of your engine. Environmentally there is less waste oil and pollution in the air, better gas mileage, less friction and heat. Whats to question?Is it ok to change a car from oil to synthetic oil at 100,000 miles?
Yes, it will be ok
yes it will be good for the engine
No problem. I was thinking about a high mileage oil for mine.
The change is no problem but not a wise choice if the engine is already using any appreciable amount of oil due to the cost factor..
Castrol Oil says,';Yes, it is okay.';
go fot it change everything to synthetic
Synthetic oil is way too expensive. There's nothing stopping you, but you have to ask yourself what the benefits would be of doubling the cost of oil for a car that already has 100,000 miles on it. I considered changing to synthetic in my Neon to get better fuel mileage, but the shop I go to told me that it wasn't worth it. Simple math tells you that, but I had no idea how much synthetic oil costs until they told me. You will most likely never recover the cost and you will probably see no benefit. That's what I have determined, anyway.
OF COURSE!!!, and don't believe the crap about not being able to mix syn and conventional or changing back to conv. after syn....








NOW syn does not cover up pre existing leaks that conventional has maybe with either sludge or seal swelling.








I'd go for it, you can always change it back.
yeah, but once you go synthetic you cannot go back
DirtyDog has the correct answer, if you switch oils.





If that Grand Cherokee has the 4.0 Six, I strongly recommend the change.
When switching to synthetic oil in higher mileage vehicles, its best to have an initial short (2,000 to 3,000 miles) oil change, both oil and filter. This will allow the synthetic oil to clean some of the engine deposits that have accumulated over time. Following this initial short oil change, continue with your normal oil change interval.
synthetic oil is better than ordinary oil, specially on old cars.its better to change it.
The change to synthetic itself will do no harm but because it will cost much more, the switch at this mileage will not be advantageous as the wear of the engine will consume more oil. It works better with a new motor.