QUOTE(bleeyw @ Oct 11 2013, 04:20 PM)
I have that knocking sound recently, when using Shell, yesterday topped up with Caltex, seems very less apparent. CFE model
I appreciate your feedback. With this information now including myself we have 3 Preve Turbos with this knocking sound.
Previously I used Petronas Primax fuel and the knocking sound is quite apparent when accelerating at low to moderate speeds. Just recently I changed to Caltex and the knocking sound has reduced quite a bit. Not entirely diminished, as I can still hear some knocking but certainly not as loud as before with Petronas Primax.
Hopefully with this 2nd refill of Caltex fuel this weekend, the knocking sound will reduce even further or perhaps diminish completely. Wishful thinking. Surprisingly the Turbo engine is quite sensitive to the type of fuel that is used.
Since you are getting the knocking sound with Shell, guess that is out. I will try Caltex for 3-4 times before deciding whether to swap to BHP. If the knocking sound is completely gone with Caltex, it appears that I will have to stick with it for good.