Anyone using Petron 97?

I was initially using BHP 97 for quite some time. Few months ago, switched to Petron 97. For the past few weeks, I was hearing a soft rattling sound coming from the front engine side, whenever I press the accelerator in low RPM range (between 1000-2000 rpm). It got a little louder over the weeks and it really felt like I was driving a 5 year old car instead of a 1 year old.

I was seriously contemplating to pay a visit to Mazda already, until few days ago I had to pump BHP 97 coz low on fuel and no other petrol stations. The rattling sound has disappeared. Engine now feels super smooth like how the car should be.

Anybody experienced anything similar?

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