Quote Originally Posted by Transporter View Post
VW504 oil is 5W30 if it says different viscosity, then it most likely isn't VW504 approved oil. I use in petrol engines Interject injector cleaner (415Y) every 3rd fill up.

It depends where you drive and how but 7,500km max. is what I do on oil in engine.

Even the Supercheap Auto is selling Shell Helix UltraExtra for less than $75/5L now, so it is not that expensive to change the oil, especially if you can DIY.
Thanks Transporter! I was a little concerned when I read that oil in the long service category can last for 15,000kms...I'll take the halfway route.