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T.5.6.1 Separate catch cans must be employed to retain fluids from any vents for the engine coolant system and engine lubrication system.
Each catch can must have a minimum capacity of 10% of the fluid being contained or 0.9 liter, whichever is greater.
T.5.6.2 Any vent on other systems containing liquid lubricant or coolant, including a differential, gearbox, or electric motor, must have a catch can with a minimum capacity of 10% of the fluid being contained or 0.5 liter, whichever is greater.
T.5.6.3 Catch cans must be:
a. Capable of containing boiling water without deformation
b. Located rearwards of the Firewall below the driver’s shoulder level
c. Positively retained, using no tie wraps or tape
T.5.6.4 Any catch can on the cooling system must vent through a hose with a minimum internal diameter of 3 mm down to the bottom levels of the Chassis.