GS service interval is 6,000 miles.
Valve check interval is 12,000 (GS) vs 26,000 (Super Tenere), but takes 20 mins versus 4 hours (?)
I found the Super Tenere cost me $1900 in scheduled maintenance to own through 28,000 miles. The GS has cost me $1500 so far in 30,000 miles.