B5.9G, B5.9LPG, B Gas Plus, B LPG Plus – 101-004   Cold Weather Starting

General Information



To reduce the possibility of property damage and personal injury, do not use starting fluids in a gaseous fueled engine.

Due to the potential for engine damage, do not use starting fluid. The use of starting fluid has no practical purpose as a cold weather starting aid in a gaseous fueled engine. The use of starting fluid will cause engine damage.

It is possible to operate gas engines in extremely cold environments if they are properly prepared and maintained. The correct lubricants, fuels, and coolant must be used for the cold weather range for which the vehicle is being operated. Refer to the chart below for recommendations in different operating ranges.

Winterize 0° to -23°C [32° to -9°F]
Winterize -23° to -32°C [-10° to -26°F]
Winterize -32° to -54°C [-25° to -65°F]
Use ethylene glycol antifreeze to protect to -29°C [-20°F]
Use 50 percent ethylene glycol antifreeze, 50 percent water mixture.
Use 60 percent ethylene glycol antifreeze, 40 percent water mixture.
Use multi-viscosity oils meeting API, CD specifications for natural gas engines.
Use Arctic oil.
Use Arctic oil.


The cold weather operating aids are required for cold weather operation.

Winterfronts and Shutters


Winterfronts can be used on a vehicle equipped with a charge-air cooler, but must be designed to partially cover the frontal area of the cooling system. A minimum of 120 square inches (11-in x 11-in) of frontal area must be left open to air flow for the charge-air cooler to function correctly.


Installations of charge-air cooler engines with shutters also requires an air intake manifold air temperature switch to open the shutters to prevent excessive intake manifold temperatures. This prevents engine damage due to high intake manifold temperatures as a result of blocked air flow across the charge-air cooler.

Last Modified:  21-Jan-2010