Technician A is correct. The proper fluid level for most manual transmissions is typically up to the bottom of the filler plug. This is the standard method to ensure that the transmission has the correct amount of fluid for optimal performance.
Technician B is incorrect. While it is true that most modern manual transmissions do use heavy weight gear lube, the specific weight range mentioned (90w - 130) is not commonly used for manual transmissions. Typically, manual transmissions use gear oil with viscosity grades such as 75w-90 or 80w-90.
Therefore, the correct answer is: a) Technician A only.
