Hello  This is my first post so hello nice to be part of the forum. I have a few concerns about a recent oil change to castrol titanium 5-30w my auris 08 1.6sr petrol. Although I was advised this oil would be fine in my engine (1ZR–FE) I’m hearing some possible valve knocking/tapping etc on cold start up until the engine reaches temp then it’s nice and smooth. Has anyone else had issues with this oil ? And if anyone has the same model as my car could u advice which oil you have found to be