My Corolla manual says 10,000km oil change interval for NORMAL driving. I drive easy here in the province, no real traffic jams, no short trips nor stop-and-go driving, and usually only 2 people in the car including driver (me). The car is driven only about 10,000kms each year.
Should I go by the manual? or should I do it more often?
the 10,000 kms interval i think is only applicable for fully synth oils. otherwise, the 5,000 km interval is still the best.
imho, if you really use these kinds of oil, then i will still recommend a 7000 kms interval. its better to spend money on oil changes than to spend money on a busted engine.
Kung mas-maraming highway driving (speeds > 60Kmh most of the time, distances > 10km per trip, baka ok lang yung 10K. Otherwise, consider it city driving and change every 5TKm.
Driving conditions here are considered extreme - dusty, hot, humid. So better change it every 5000 kms. just to make sure, you wouldn't want your engine to sieze up.