They updated it so it doesn't freeze shut with sludge and destroy your engine.
Moisture accumulating in the engine oil separator; hose to oil dipstick guide tube; or the orifice in the dipstick guide
tube can freeze. When this occurs, depending on the position of the internal valve, it may either cause high crankcase
pressures (stuck closed) resulting in valve cover leakage and/or breakage, or cause an oil hydro-lock condition (stuck
open), which could result in engine damage.
If the vehicle is not equipped with the new insulated crankcase ventilation valve and hose, replace those parts
with the updated style and replace the dipstick guide tube with the part number from the list by model below.
SI B 11 08 03