Hi All - new here. I am based in the UK with a 2001 Previa CDX - same as Tarrago in Oz. Engine was replaced at 165,000 miles runs well but prone to pinging under load. It's done 30,000 miles now so well and truly run in but it hates standard unleaded and will only not complain on Premium fuel with Redex. I also had the CAT replaced 6 months ago but it still likes to rattle. Any suggestions very welcome. Thanks.