Make sure they actually topped it off... I think my guys were too lazy to pull the intake tube and only topped off the active tank last time, I had to put almost 5 gallons in since my last service
They will be getting specific instructions when I take it in this week.
Herbert - '12 X5 35d / Sapphire Black / Black Perf Nevada / Aluminum trim / ZPP / ZPS / ZCW / ZAV / Apps / 3rd row
Betty - '04 CTS-V / Black Raven / Black Leather & Suede / 6 speed LS6 combo 400 hp & 400 tq
Sterling - '06 Silverado HD / White / Grey Leather / LBZ Duramax - Allison 6 speed combo / Crew Cab Short Bed LT3