Definitely the maintenance is not expensive for the vehicle of this size.
Listing the maintenance required.
Every 15000Kms :
Change engine oil :~2400INR (8 ltrs)
Oil filter : ~190
Should come around 4000K including water service and labour in ASS.
Every 30000 Kms or 2 Years:
Change engine oil :~2400INR (8 ltrs)
Oil filter : ~190
Fuel Filter : ~1600
Power steering fluid:~270
Clutch and brake fluid : ~100
Total around ~ 6500
Every 45000 Kms or 3 Years:
Change engine oil :~2400INR (8 ltrs)
Oil filter : ~190
Air Filter : ~700
Brake pad replacement if needed ~ 3000
Gear/Transmission oil ~ 1500
Total around ~ 8500
For AC gas refilling if cooling is reduced : Complete fill 1200 Rs.
Front suspension overhaul (Replacement based on usage. Range from 60000 kms to 100000 kms): ~20000 rs in ASS. ~15000 rs outside garages.
Clutch set (Replacement based on usage. Range from 60000 kms to 100000 kms): 12000 rs in ASS ~ 9000 rs in local garages.
There is no need for oil change before 15000Kms. The manual will say about dusty roads means change at every 7500 kms.But in real life, we can segregate the usage as city driving and highway driving.More city driving means more dusty driving.
So if usage is 50:50, changing at 15000kms is enough. If the vehicle is completely driven in the city driving then oil can be changed at 10000kms itself. But as far as safari is concerned hardly there will be any vehicle which will do complete city driving.
Also there is no need to add any performance oil/additive. There are fuel additive, engine oil additive,brake oil additive, power steering oil additive, gear oil additive and so on. Most of the ASS will add these stuff in their respective oil replacement and double the service cost. Even i have been experienced the same in my last service, instead of getting around 7500 rs as service cost for around 13500 rs. The additive oils and the labour for additive alone contributed 5000 rs.
Those mentioned additives may or may not improve the conditions, but the as the name suggest its additives not mandatory ones. So no need to spend the extra money for the additives.
So basically if a 6 lac car have a average maintenance cost of 10000 rs, then the 12 lac car will definitely have a minimum maintenance cost for 15000 rs.