20" wheels were never factory fitted to the TD6 as they caused vibration at a standstill.

I have no idea how or why, but seems a well documented issue over the years.

Having bigger wheels on doesn’t cause the problem, it highlights it. There is vibration there as the driveshaft runs through the sump....the higher aspect ratio/bigger sidewalls on the tyres used on 18 inch wheels pretty much mask it. Land Rover never offered 19 or 20 inch wheels on a TD6.

I think in D....the vibration seems to feed itself, but hardly there when in N.

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

I had the same issue. Mine turned out to be an injector fault.

19” wheels were eventually approved for the TD6, but only with a revised engine management calibration to counteract the torsional vibration/oscillation issue.

Click image to enlarge

Click image to enlarge

Do we need to have this update then if running car on 22inch wheels Phil? Is this something only the stealers can update also.
Cheers
J Range Rover Vogue SE 4.4 SDV8 SVO Stying Pack
Audi A4 2.7 TDI S Line Black Edition phantomn black
Previous Cars
Range Rover Vogue SE Overfinch Styling 22" Elara's full black stealth colour coded
Java black Range Rover sport 2.7 TDV6
Alaska white Range Rover sport overfinch 3.6 TDV8
BMW M3 Carbon Black