I think it is generally accepted to change auto oil around 80,000 klms and possibly sooner if doing lots of towing or city driving.
Many of us are using Penrite BMV as a substitute for the expensive Lifeguard ZF oil.
I have been using BMV for just over 100,000 klms (changing around 65,000) and no probs whatsoever.
I think you can use 19" wheels on the RR (my Disco has them and MY13) but not a massive choice in tyre selection compared to 18".
Plenty of S/H 19" wheels available from those who change to 18".
Am using Goodyear Wrangler Duratrac over all sorts of surfaces incl sand and very happy with them. Will exceed 70,000 klms and definitely buy again as they have 'upgraded' the tyre with stronger sidewalls amongst other things. Not that I experienced a problem.
				
			 
			
		 
			
				
			
			
				Before: Ser 2a LWB, Ser 3 S/W, 1979 RR 2 door, 1981 LR Stage 1 V8 (new), 1985 LR 110 V8 County (new), 2009 RRS TDV8
Now: MY13 D4 TDV6. "E" rear diff. Cambo's magic Engine & Auto Tune. 1968 Austin 1800 Mk1 auto (my 5th)
			
			
		 
	
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