To my knowledge maruti recommends 10k kms of oil change interval for the semi-synthetic engine oil. Is it same for the mineral oil too?
Since you wish to drive at higher rpm, there are more chances to get carbon deposits. So here I don't recommend mineral oil, mineral oils are not much efficient in avoiding this.
What is your normal usage of rpm range? And to what rpm range you are thinking to increase?
Generally I drive in between 2-3k rpm with occasional sprinting upto 4k rpm and I do very rarely goes upto 5k rpm(Only when the situation calls for it
)
With this usage I change my engine oil after 12,000-13,000 kms ( I use Mobil1 fully synthetic 5w-30 engine oil)
Which grade of engine oil is filled during this 3rd service?
Thats a good score