Vehicle: 2004 isuzu crosswind 2.5 liter 4JA1 engine
When I check my transmission fluid level while engine is not running it sits perfectly on the 'C' level. But when I check it while the engine is running and I run the transmission through all its gears it doesn't even reach the dipstick. Is this normal? Also I'm feeling the symptoms of having a low transmission fluid level.
Additionally, up to what level should I add more fluid if in case I need to.