Hi guys I did an oil change on my 2004 4.4 range rover yesterday and the car has now developed a noticeable ticking/ knocking sound when idling once the engine has warmed up. When the engine is cold and is started it sounds fine with no noise at all but as soon as it's warmed up after say 5 mins the ticking/knocking is there.

As far as I'm aware the car had 5w30 fully synthetic engine oil in it before on it's last service and I replaced it with a 5w40 fully synthetic that meets all required oil specs for the car (the oil is by Triple QX).

I can't be 100% sure the sound wasn't there before the oil change but I'm pretty sure it wasn't as I recall the engine was quiet when warmed up and idling. I wanted to ask what the learned experts on this forum think I should do next - should I be looking to change the oil again back to a 5w30 or is the ticking/knocking noise when engine is warm and idling not serious?

The engine is on 144k miles, I don't know if that bears any relevance - which oil grade is better suited to older engines? The engine drives fine and idles smoothly and I have not noticed any difference in performance or economy since the oil change.

Thanks in advance for any advice. 2004 Range Rover Vogue 4.4 v8 LPG, Java Black, 22' Hawke Alloys, Black Beast

http://www.rangerovers.net/forum/6-range-r...noise.html

Phil

Hi thanks for the link but I had found and read that thread when I googled my symptoms. A couple of differences from that thread are that in my case as soon as throttle is applied the tapping/knocking sound stops and it does not get faster with engine rpm. Also with my engine the sound is not noticeable with the bonnet closed and only becomes apparent when the bonnet is opened.

There seems to be a wide range of possible causes for the noise, from vanos to timing chains etc so I was hoping someone on this forum with expert knowledge may know the definitive cause of the sound and more importantly if it is something that will cause extra engine wear and damage over time? 2004 Range Rover Vogue 4.4 v8 LPG, Java Black, 22' Hawke Alloys, Black Beast