I would like to ask if I may, my new car is about 14000 km now after a year. Thus i rarely travel far and long.

I do drive alot in city with stop & go traffic and thus I will never reach 10,000km OCI by 6 months.

My question is must I follow that 6 months interval? Is there an expiry date for my engine oil? Let's say in 6 months I only driven 3000 km but daily and short trips.

Can I prolong  it to 10,000 km then only change even though it'll take 1 year and more?

I'm using Petronas syntium 800 10w-30 semi synthetic btw. And the car is proton saga campro vvt.