I've had to read this over again. I love the manner you wrote this. I understand that sometimes knocking as referred to by the so called mechanics is a situation where ur engine lacks lubrication or runs on no lubrication, and hooks. So what do I call that.
I will be sure to check my car's octane rating But, do filling stations have different fuel here in Nigeria
Nigerian filling stations claim to sell premium grade fuel, however, the range you'll get is between 90-93