How many supplementary cards can I apply under this latest promotion, to be eligible for the RM 300 cashback?
I've tried enquiring via Standard Chartered call centre a few times and I've been given different answers each time for the same question.

One person said no matter how many supplementary cards I apply, I will be entitled to the RM 300 cashback for one supplementary card only.

While another person said, I can apply for upto 5 supplementary cards and I will get RM300 cashback for ALL 5 cards.

So which is the right answer?

Can 1 person hold multiple supplementary card from different principal card holder?

Can 1 person hold multiple supplementary card from different principal card holder and still be eligible for the RM 300 cashback promo?

I have the standard chartered business visa card that gives me 15% cashback on petrol. I was wondering if the 15% cashback will be applicable if I buy engine oil from the petrol station?

That happened to me also, double cashback. But they minus back the following month.