I am a multiple Mercedes owner and I like to share my view.
The most important consideration before you put money into a RM 260k car is to put your priorities right.
Before you put that kind of money into a car, make sure you have accumulated enough hard assets in life aside from a stable paying job. What I mean by hard asset include a thriving business, fully paid properties/lands or properties/lands which have appreciated far beyond the cost that you paid for.
When you have either of these hard assets, owning a RM 260k car is a non issue because you know you have all these appreciating assets to back you up.
As for the income level to own a RM 260k car, I would say it is RM 10k and above in Malaysia. Why 10k? The average Malaysian here only make RM 6-8k max in their working life. Thats why you see plenty myvis and japanese cars on the road which they could only afford.
Once you hit rm10k take home pay before bonuses, I think you have demonstrated the ability to earn more and your income will not stuck at RM 10k forever. When I made my first 10k, I went on to make multiples on occasional months which makes owning the car easier.
10k is no where near enough to buy a 260k car.. a salary man will not make multiples of 10k on occasional months..