I've recently bought a 3SGE Altezza and noticed at around 7000rpm engine gets a bit of a rattle going on, it sounds to me like its valve/head related.
Has anyone come across this? I've given the engine a flush and good 5w30 oil, it didn't change the noise at all but did make it run noticebly better.
Do people actually check valve clearances or do they not really change over time?
I bought the car off my brother in law and its been pretty well looked after, serviced every 5000kms since 60,000kms and its now done 135,000kms.