So instead of saying 'do servicing at 6/12 months', why not, as Toyota say, service at certain kilometerages (don't have miles in Thailand), or a certain time, WHICH EVER COMES FIRST.
A Black % Tan was/is a light beer ie pale ale, lager, topped with a dark beer, usually Guiness.
A Black Velvet is Guiness & sparkling wine.
A Snakebite is Guiness and lager.
I am surprised that an Annual Check-up is covered by Cigna, who refused to pay Bht 600 for medications I had to take home with me.
Obviously, you are covered for out=patient procedures, so get that knocked off for starters.