Guys, the manufacturer's recommendations have a BUNCH of safety factor built in. Remember, if the recommended service is done as scheduled then for the first 50k any problem is LR's. They wouldn't take that risk if there was much risk to it. So I have the dealer do the service every 7.5k (and have them put in the oil that LR is paying for) and my first LR3 never had a single lubrication related problem when I traded it at 50k, and my second one has never had any problem (at 23k).
This junk about changing the oil at 5k, 3k, every year, bring your own oil, etc., is just so much fear and superstition that I can't believe it. I drive both my Land Rovers (my wife has an LR2) very hard, a lot of time off road in low range, a lot of time in the mud, extended trips at highway speed, and no problems. My dealer is great, and if the service manager or his technicians saw any problem with the oil or the filter they would have told me about it (they really want to avoid replacing an engine).
When I was a kid (got my first car 40 years ago), the oil was such crap that after 3k miles it HAD to be replaced. The filters weren't much better. Today the oils and filters are really outstanding and if it wasn't for the warranty issues I'd change mine at 15k.
David