After giving the Accord a good run and plenty of VTEC on Saturday, I noticed a bit of a rattle from 2.5k ish and above. Can't really hear it above 5k ish as the engine just gets pretty loud naturally by then. Revving when in neutral or with the clutch in I can't notice anything. I immediately shat myself and assumed the worst, but Loplop reckons it sounds like pinking. I've never really heard pinking in another car so have nothing to compare it to. Sounds kinda top end ish, could it be anything in the head like a fucked cam or tappet? I assume it's not as it can't be heard unless under load. It's on V Power so it's not being caused by shit fuel, but would it be worth trying octane booster? As higher octane is more resistant to pre ignition, so would show if it is pinking surely? Not sure what oils in it as I've only just bought it but I've been topping it up with 5W40 Castrol Edge. Cheers! Also sorry about the big block of text, I put it in paragraphs but my phones fucked it up.