vffgaston:
dougp:
If you're not in the U.S. YMMV.What does this mean?
Well, first of all that you're most likely not in the US 
That's a very American expression.
YMMV = Your Mileage May Vary. Commonly used in automotive advertisements where fuel economy claims were made. Nowadays often used as "it could be a different situation/circumstance/... for you". In this case: different safety regulations.