I remember having a chat about service intervals and oil with the local Honda dealer (then the Suzuki dealer and the Yamaha dealer just to be fair) when I was looking to replace my old R1150GS last year.
The GS has 6000 mile intervals using bog standard oil from the local petrol station. Why then did all three dealers insist that 4000 mile intervals were necessary on their products? Honda chap just smiled, the Suzuki chap changed the subject and the Yamaha chap dribbled on about oil quality these days not being advanced enough to last 6000 miles.
Bearing in mind I put 60k miles on the GS and self serviced every 6k for most of those miles they were talking a load of old pony methinks - though I'm sticking with the Honda service intervals anyway

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