My last bike, a 1200GS was 'out of warranty' too and I opted for non BMW servicing in the form of DIY for basic stuff and if anything specialist needed done was going to go for BMW or indie.
Problem is, I traded the bike in for an 07 RT with 12k on the clock and following a good clean up which the previous owner was averse to, the only fault I could find was a corroded front engine cover. My GS had the same part replaced FOC by BMW when it was within warranty and I had heard that out of warranty, BMW may cover the cost of the item if the customer paid the labour, so I went to John Clark Aberdeen to check it out.
As the BMW had a full BMW service history, BMW paid for parts and labour, even although the bike was out of warranty!!
My initial thought were.....must get the bike serviced at BMW, maybe worth the extra cash?? Who knows?
The extra irony is that John Clark Aberdeen no longer sell motorcycles cos they make more money selling minis and needed the space in the showroom!!
They only have one bike mechanic and will only continue servicing and repairing bikes as long as he is there!! And theres more, the tecnician Craig Stewart, is a top bloke who takes time to speak to you and is one of only three BMW technicians in the UK to pass the BMW Motorrad ATA Master Technician course, the highest technical grade in the UK.
Keith
spoke to the service dept who advised me as the bike is 5 years old brake fluid, gear box oil rear axle oil needs to be changed and that alone is nearly £180.00 alone! 
