Second, it prevents the pressurized gases from travelling down the cylinder, picking up an oil mist and moving the oil mist through the crankcase ventilation system where it is ultimately burned in the combustion chamber. Fleet personnel also comment that oil pressure is more stable with Series 3000 than with the conventional oil. In cold temperatures, more stable oil pressure indicates better cold temperature lubrication. Petroleum-lubricated engines often indicate low or no oil pressure after cold temperature startups because the thickened oil sits in the sump instead of flowing. Fuel Economy Fuel economy will be evaluated later in the demonstration to allow for long-term data gathering.
Fuel efficiency varies according to season, load, route and other factors.