Defining Stressful Driving Conditions In Relation To Motor Oils

You may wonder what types of driving conditions are considered stressful when considering the viscosity and change interval of motor oil for your vehicle. Although the word "stressful" can be subjective, there are some parameters that should be followed in the best interest of proper vehicle maintenance.

Extreme Weather Conditions

When the temperature drops below freezing, the motor oil takes longer to warm. This can result in condensation forming inside the crankcase, especially during short trips. Sub zero conditions only worsen the condition. Water and other contaminants will degrade the quality of the oil which will shorten and eventually stop the ability of the oil to lubricate properly.

On the other hand, hot weather can present a problem with the thermal breakdown of the oil. On a hot summer day while driving on at high speed, the motor oil temperature can easily rise to the point that the viscosity begins to decrease, thus lowering the oil pressure. You want to be sure that your motor oil is up to the task and will not evaporate or breakdown which can eventually lead to the creation of sludge.

Excessive Idling

In addition to decreasing fuel economy, excessive idling does not allow the fuel to combust properly which can lead to fuel dilution in the motor oil. This can negatively effect the viscosity and additives in the motor oil which will hamper the ability of the oil to function properly, leading to an increase in wear.

Short Trips vs. Long Trips

Short trips of under approximately ten miles are normally not enough to let the engine fully warm. These trips will shorten the life of the oil and would be considered stressful. Conversely, long trips allow the engine to operate under full operating temperature, ideally at highway speeds. It should be noted, however, long trips at aggressively high speeds in very hot weather can be considered stressful as mentioned above.

Towing, Plowing, Heavy Loads and Dusty Conditions

Of course operating a vehicle under conditions which clearly cause the vehicle to strain the engine, like towing, would be considered severe service. However, even normal operation under dusty conditions will contaminant the motor oil and shorten its life.