Hi

Could anyone help me to sort out about what type or let me say correct of petrol should I load to my premacy? I purchased my premacy 8 months ago and I'm using 91 octane since the day I used it. I'm not sure if there will be any issue on the mechanical or engine if I keep using a wrong type of petrol?

A little bit of detail, 2 weeks after I purchased my premacy. The Check engine light suddenly appear. But the next morning after that day, the check engine light is no longer there (not lighting) anymore. A few months maybe 4-6 months of driving it everything seems to be normal. but a 2 months ago, the check engine light came up again and now.it is almost there most of the time. but sometimes it will be gone. I'll tried to return it back to the dealer and they said that I must be using a 95 octane not a 91 octane? actually, I'm confused now...it I may be wrong, or the car dealer is trying to put the fault on me...I would highly appreciate your help.

Cheers!