Few questions, First off, please forgive me if this has been discussed before. I did do some research and online searching, but came up with no answers. I'm a big Amsoil fan. I use it in everything I have (vehicles, tractors, lawn equipment, dirtbikes... Etc) I'd like to run it in my new YZ450FX and intended on doing so, until I saw this, on the reverse label.... "RECOMMENDED for separate sump applications, including the Honda CRF and many two stroke dirtbikes" Now I emphasize "recommended" because the oil DOES meet the specifications required for my yz. But... It is "recommended" for separate sump applications, the Yamaha 4 strokes are not separate sump, and require one oil for both engine and drivetrain. So, assumptions/questions: - the oil is formulated more towards a gear oil? - but will work decently as an engine oil? I'm sure that I am overthinking this and have already been running it in my bike. But it's been on my mind and curious if any fellow yz 4t'ers are running the same oil. One other thing, When doing oil changes in my yz250 2T, I never used the check bolt as an "indicator", always used a measured amount of oil when performing an oil change. The YZFX book says to put in a specified amount, let the oil drain out of the check bolt, then loosen the oil pressure bolt, start the engine and wait <30ish seconds until oil begins to flow. Do y'all use the check bolt or pour in the correct amount?