Other problems (if it is oil draining down from where it shouldn't) are sometimes caused by the wrong oil filter being used, or the non return valve in the filter being broken - have you had it serviced recently?

Craig Steger-Lewis

2006 D3 Thailand Media Vehicle Stages 1 & 2

2004 D2 Landmark Auto (much missed already!)

Sounds like a hydraullic tappet, but I had a similar noise from my engine although it was there all the time, it went back to Keith Gott's for repair and it turned out to be a rocker sticking/seizing on the rocker shaft. Perhaps a call to KG may help.

Regards

Alan

If your Discovery has been stood for a few weeks , the oil will drain back and on first start up you will get the rattle. Now you are using it daily  no rattle ??