Does synthetic oil really last longer between oil changes?

i've been using Castrol Magnetic 10w40 (Synthetic Blend) oil for long time and thinking about going Shell Hulix Ultra 5w40 fully synthetic oil.





i change oil/filter every 5000km on castrol oil and now. is it really true that full synthetic oil can go longer miles? if it does what should be my change interval? 7500km? 10000km?Does synthetic oil really last longer between oil changes?
yes it lasts longer my dad is a master mechanis and i just did a oil change on my car and he told me to get synthetic cuz it goes longer between each oil changes.Does synthetic oil really last longer between oil changes?
Depends on how you drive. The major killer of motor oil is absorbed moisture. All cars will suck moisture as they heat-up %26amp; cool down, can't be helped. But what can be helped is driving the car long enough to get the oil hot enough that the moisture will evaporate %26amp; get sucked into the PCV valve.





So if your daily commute is 15 or 20 minutes, and that's most of your driving, you should be changing oil per the owner's manual. If you go to visit Aunt Matilda every Saturday, and that's a 90 minute drive each way, that's more then enough to get the oil up to temp %26amp; clean all that nasty water outta there. Then maybe every 5,000 or even 6,000 miles would do ya.





If your daily commute is an hour, plus two traffic jams %26amp; a fender bender, that heats things up every day, and you could go every 8 or 9,000 miles.





Back to school - The advantage of synthetic motor oil is in it's stable viscosity. Thirty weight full synthetic oil is 30 weight at 15 degrees below zero and at 140 degrees in the shade. It doesn't thicken when cold or thin when hot, like conventional oil. It doesn't handle dirt or moisture much better then regular oil. A good oil filter is all you can do for that problem.





You now have the secret of the ages - Use this knowledge wisely, grasshopper.
If you put a lot of miles on your car ( 20,000miles / 32000 KM ) a year you can extend your oil change interval to 4000 or 5000 miles easy ( 6400KM to 8000 KM ) on just regular good quality motor oil.


Have been doing it for years at work and we have enignes with 250,000 miles on them and still going strong on original timing chain, etc. Never had to make any major repairs, 99% still have original valve cover gaskets.


Vehicles we have with oil change minders from the factory do not turn the light on until 5500- 6000 miles .